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Abstracts of new mineral descriptions.

Bigcreekite

Orthorhombic

Ba[Si.sub.2][O.sub.5].4[H.sub.2]O

Locality: The type locality is the Esquire #7 claim (Section 27, T11S, R25E, Mount Diablo Meridian, Lat. 36[degrees]55' N, Long. 119[degrees]14'42" W), along the west side of Big Creek, eastern Fresno County, California, USA. Also along the northwestern slope of Trumbull Peak, Mariposa County, California, USA (NE 1/4 Section 9, T3S, RI9E, Mount Diablo Meridian).

Occurrence: In fractures in gneissic rocks composed of sanbornite, quartz, diopside, pyrrhotite and barium-bearing minerals. Other minerals from the type locality are: alforsite, walstromite, anandite, bazirite, benitoite, celsian, gillespite, fresnoite, muirite, macdonaldite, pellyite, titantaramellite and verplanckite.

General appearance: Subhedral crystalline masses mm in length.

Physical, chemical and crystallographic properties: Luster: vitreous to pearly. Diaphaneity: probably transparent to translucent. Color: white to colorless. Streak: white. Luminescence: nonfluorescent. Hardness. 2 to 3. Tenacity: brittle. Cleavage: {101} and {001} perfect. Fracture: uneven. Density: 2.66 g/[cm.sup.3] (meas.), 2.76 g/[cm.sup.3] (calc.). Crystallography: Orthorhombic, Pnma, a 5.038, b 9.024, c 18.321 A, V 833 [A.sup.3], Z4, a:b:c = 0.5583:1:2.0303. Morphology: no forms were mentioned; habit tabular, elongate on [100]. Twinning: none mentioned. X-ray powder diffraction data: 5.068 (100) (013), 4.054 (85) (022), 2.974 (45) (031), 2.706 (60) (124), 2.327 (40) (035), 2.257 (75) (126). Optical data: Biaxial (+), [alpha] 1.537, [beta] 1.538, [gamma] 1.541, 2V(meas.) 59.2[degrees], 2V(calc.) 60[degrees]; dispersion r<v, moderate; nonpleochroic; orientation, X = b, Y = a, Z = c. Chemical analytical data: Means of four sets of electron microprobe data (with [H.sub.2]O calculated to give 4[H.sub.2]O: [Na.sub.2]O 0.11, CaO 0.03, BaO 48.88, SrO 0.02, Si[O.sub.2] 38.16, [H.sub.2]O (22.94), Total (110.14) wt,%. Empirical formula: [([Ba.sub.1.00][Na.sub.0.01]).sub.[SIGMA]1.01] [Si.sub.1.99] [O.sub.5.00].4.00[H.sub.2]O. Relationship to other species: Its structure has similarities to those of sanbornite and gillespite.

Name: For the locality. Comments: IMA No. 1999-015.

BASCIANO, L. C., GROAT, L. A., ROBERTS, A. C., GAULT, R. A., DUNNING, G. E., and WALSTROM, R. E. (2001) Bigcreekite: a new barium silicate mineral species from Fresno County, California. Canadian Mineralogist 39, 761-768.

Bradaczekite

Monoclinic

Na[Cu.sub.4][(As[O.sub.4]).sub.3]

Locality: North Breach of the Great fissure eruption, Tolbachik volcano, Kamchatka Peninsula, Russia.

Occurrence: in a fumarole. Associated minerals are: hematite, tenorite, lammerite, urusovite, orthoclase and johillerite.

General appearance: Aggregates of elongate plates. Individual crystals are about 0.2 mm long and 0.1 to 0.2 mm across.

Physical, chemical and crystallographic properties: Luster: adamantine. Diaphaneity: transparent in transmitted light. Color: dark blue. Streak: light blue to white. Luminescence: nonfluorescent. Hardness: not given. Tenacity: not given. Cleavage: none observed. Fracture: not given. Density: not given, 4.77 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, C2/c, a 12.051, b 12.434, c 7.2662 A, [beta] 117.942[degrees], V 961.8 [A.sup.3], Z 4, a:b:c = 0.9692:1:0.5844. Morphology: (010}, {311}, {111}, (112} well-developed; {301}, {001}, {321}, {101}, {100}, {021}, {110}, {131}, {111} and {341} are common. Twinning: none mentioned. X-ray powder diffraction data: 6.22 (13) (020), 3.60 (21) (202), 3.43 (100) (112, 310), 3.21 (35) (002), 2.791 (24) (402), 2.696 (18) (330), 2.683 (30) (240), 2.665 (17) (400). Optical data: Biaxial (--), [alpha] 1.76, [beta] 1.92, [gamma] 1.96, 2V(calc.) 50[degrees]; dispersion not given; strong pleochroism X = violet-red, Y = green, Z = greenish blue; Z = b, X^c = 23[degrees] (in obt use angle [beta]), Z^c = 5[degrees] (in obtuse angle [beta]). Chemical analytical data: Means of thirty-seven sets of electron microprobe data: [Na.sub.2]O 5.17, [K.sub.2]O 0.35, CuO 43.13, ZnO 0.79, [Fe.sub.2][O.sub.3] 0.38, [As.sub.2][O.sub.5] 49.62, [V.sub.2][O.sub.5] 0.13, Total 99.57 wt.% (given as 99.55). Empirical formula: [([Na.sub.1.16][K.sub.0.05]).sub.[SIGMA]1.21][([Cu.sub.3.76][Zn.sub.0 .07][Fe.sup.3+.sub.0.03]).sub.[SIGMA]3.86][([As.sub.1.00][O.sub.4.00] ).sub.3.00]. Relationship to other species: It is the Na-, Cu- and As[O.sub.4]-dominant member of the alluaudite group.

Name: For Hans Bradaczek (1940-), crystallographer at the Free University, Berlin. Comments: IMA No. 2000-002.

FILATOV, S. K., VERGASOVA, L. P., GORSKAYA, M. G., KRIVOVICHEV, S. V., BURNS, P. C., and ANANIEV, V. V. (2001) Bradaczekite, Na[Cu.sub.4][(As[O.sub.4]).sub.3], a new mineral species from the Tolbachik volcano, Kamchatka Peninsula, Russia. Canadian Mineralogist 39, 1115-1119.

Carraraite

Hexagonal

[Ca.sub.3]Ge[(OH).sub.6]([SO.sub.4])([CO.sub.3]).12[H.sub.2]O

Locality: Gioia quarry, Colonnata valley, Carrara basin, Apuan Alps, northern Tuscany, Italy.

Occurrence: In calcite vein cavities within the famous Carrara marble. Associated minerals are: azurite and volborthite. It is a hydrothermal alteration product of copper-vanadium sulfides such as sulvanite and colusite. Crystals of colusite with Ge contents of 1.3 wt.% have been found in the Carrara area.

General appearance: Prismatic to tabular submillimetric crystals.

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: transparent to translucent. Color: white. Streak: white. Luminescence: not mentioned. Hardness: not given. Tenacity: not given. Cleavage: none observed. Fracture: not given. Density: could not be measured because of the small size, 1.97 g/[cm.sup.3] (calc.). Crystallography: Hexagonal, [P6.sub.3]/m, a 11.056, c 10.629 A, V 1125.2 [A.sup.3], Z 2, c:a = 0.9614. Morphology: (100}, (001}. Twinning: none mentioned. X-ray powder diffraction data: 9.57 (vs) (100), 5.53 (s) (110), 3.83 (s) (112), 3.56 (ms) (202), 2.74 (ms) (302), 2.53 (m) (213), 2.38 (m) (312), 2.18 (m) (223), 2.13 (m) (313). Optical data: Uniaxial (-), [omega] 1.509, [epsilon] 1.479, nonpleochroic. Chemical analytical data: Means of seven sets of electron microprobe data: CaO 35.70, Ge[O.sub.2] 18.15, [SO.sub.3] 16.19, Total 70.04 wt.%. The sample decomposed in the electron beam. Here, 53.75 wt.% [H.sub.2]O and 8.75 wt.% [CO.sub.2] were added to give 15([H.sub.2]O) and 1([CO.sub.3]); this raises the analytical total to 132.54 wt.%. Recalculation to give 100.00 wt.% gives: CaO 26.94, Ge[O.sub.2] 13.69, [SO.sub.3] 12.22, [CO.sub.2] (6.60), [H.sub.2]O (40.55), Total (100.00) wt.%. Empirical formula: [Ca.sub.320][Ge.sub.0.87][(OH).sub.5.84][([SO.sub.4]).sub.1.02][([CO. sub.3]).sub.1.00].12.08[H.sub.2]O. Relationship to other species: It is a member of the ettringite group.

Name: For the Carrara region. Comments: IMA No. 1998-002. Because of the very small size of the crystals, many of the usual physical properties could not be determined. Prof. Merlino kindly supplied additional data. The crystal drawing produced here is based on the SEM image in the paper.

MERLINO, S. and ORLANDI, P. (2001) Carraraite and zaccagnaite, two new minerals from the Carrara marble quarries: their chemical compositions, physical properties, and structural features. American Mineralogist 86, 1293-1301.

Clearcreekite

Monoclinic

[Hg.sup.1+.sub.3]([CO.sub.3])(OH).2[H.sub.2]O

Locality: A small prospect pit near the long-abandoned Clear Creek mercury mine, New Idria district, San Benito County, California, USA.

Occurrence: In a brecciated rock consisting mainly of ferroan magnesite and quartz. Associated minerals are: cinnabar and edoylerite.

General appearance: A small cluster of subhedral crystals (up to 0.17 mm).

Physical, chemical and crystallographic properties: Luster: given as vitreous but optical data indicate adamantine. Diaphaneity: transparent. Color: pale greenish yellow. Streak: pale greenish yellow. Luminescence: nonfluorescent. Hardness: could not be measured but probably is low. Tenacity: brittle. Cleavage: {001} good. Fracture: uneven. Density: could not be measured, 6.82 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, [P2.sub.1]/c, a 6.760, b 9.580, c 10.931 A, [beta] 105.53[degrees], V 682.1 [A.sup.3], Z 4, a:b:c = 0.7056:1:1.1410. Morphology: {001} major and (010} minor. Twinning: none mentioned. X-ray powder diffraction data: 7.09 (70) (011), 5.40 (30) (110), 5.32 (40) (ill), 4.62 (90) (012), 3.058 (30) (031), 2.831 (100) (023), 2.767 (100) (211, 221), 2.486 (30) (202), 2,391 (40) (040, 204), 1.692 (30) (244, 402). Optical data: No data could be measured. Indices of refraction probably are higher than 2. Chemical analytical data: An electron microprobe analysis gave [Hg.sub.2]O 84.65 and values of [CO.sub.2] and [H.sub.2]O of 6.16 and 6.30, respectively were calculated from the crystal structure data, Total 97.11 wt.%. Empi rical formula: [Hg.sup.1+.sub.2.92][([CO.sub.3]).sub.1.01][(OH).sub.0.90].2.07[H.sub .2]O. Relationship to other species: It is a monoclinic polymorph of peterbaylissite.

Name: For the locality. Comments: IMA No. 1999-003. The crystal structure has been solved.

ROBERTS, A. C., GROAT, L. A., RAUDSEPP, M., ERCLT, T. S., ERD, R. C., MOFFA'IT, E. A., and STIRLING, J. A. R. (2001) Clearcreekite, a new polymorph of [Hg.sup.1+.sub.3]([CO.sub.3])(OH).2[H.sub.2]O, from the Clear Creek claim, San Benito County, California. Canadian Mineralogist 39, 779-784.

Ekatite

Hexagonal

[([Fe.sup.3+],[Fe.sup.2+],Zn).sub.12][(OH).sub.6][(As[O.sub.3]).sub.6 ][[As[O.sub.3],HOSi[O.sub.3]].sub.2]

Locality: Tsumeb, Namibia.

Occurrence: Associated minerals are: etched quartz and chalcocite.

General appearance: Sprays of striated, fine needles (up to 2 mm long and less than 0.2 mm in diameter).

Physical, chemical and crystallographic properties: Luster: given as bright vitreous, but the indices of refraction indicate adamantine. Diaphaneity: translucent. Color: brownish black. Streak: brown. Luminescence: nonfluorescent. Hardness: about 3. Tenacity: brittle. Cleavage: none. Fracture: not given. Density: not measured, 4.11 g/[cm.sup.3] (calc.). Crystallography: Hexagonal, [P6.sub.3]mc, a 12.773, c 5.051 A, V 713.7 [A.sup.3], Z 1, c:a = 0.3954. Morphology: indistinct (hk0} forms were mentioned. Twinning: none mentioned. X-ray powder diffraction data: 11.11 (30) (100), 6.37 (50) (110), 3.220 (100) (211, 220), 2.766 (30) (400), 2.420 (70) (401,410), 1.867 (30) (402), 1.672 (30) (521), 1.507 (30) (701,531). Optical data: Uniaxial (+), [omega]~ 1.99, [epsilon]~ 2.08, pleochroism O = dark brownish clack, E = medium brown. Chemical analytical data: Means of two sets of electron microprobe data: FeO 21.19, ZnO 3.80, [Fe.sub.2][O.sub.3] 27.26, [As.sub.2][O.sub.3] 42.56, Si[O.sub.2] 2.12, [H.sub.2]O 3.42, Tota l 100.35 wt.%. The structure determination was the basis for calculating [Fe.sup.3+] and [Fe.sup.2+] from total Fe and [H.sub.2]O from OH. Empirical formula: [([Fe.sup.3+.sub.6.02][Fe.sup.2+.sub.5.20][Zn.sub.0.82]).sub.[SIGMA]1 2.04][(OH).sub.6.07][(As[O.sub.3]).sub.6.06][[[(As[O.sub.3]).sub.1.52 ][(HOSi[O.sub.3]).sub.0.62]].sub.[SIGMA]2.14]. Relationship to other species: Structurally related to phosphoellenbergerite, ellenbergerite and holtedahlite.

Name: For Dieter Ekat (1935-1996), a Namibian mining engineer and former owner of the Rubicon mine, Namibia. Comments: IMA No. 1998-024. The subscripts of the empirical formula given here are slightly different from those given in the paper.

KELLER, P. (2001) Ekatite, [([Fe.sup.3+],[Fe.sup.2+],Zn).sub.12][(OH).sub.6][[As[O.sub.3]].sub.6 ][[As[O.sub.3],HOSi[O.sub.3]].sub.2], a new mineral from Tsumeb, Namibia, and its crystal structure. European Journal of Mineralogy 13, 769-777.

Fencooperite

Trigonal

[Ba.sub.6][Fe.sup.3+.sub.3][Si.sub.8][O.sub.23][([CO.sub.3]).sub.2][C l.sub.3].[H.sub.2]O

Locality: Trumbull Peak, on the western slope of the Sierra Nevada Range in NE S. 9, T3S, R19E, Mount Diablo Meridian (Lat. 37[degrees]40'58" N, Long. 119[degrees]47'08"W), about 67 km northeast of Merced and 8 km west of El Portal, Mariposa County, California, USA.

Occurrence: In barium-silicate-rich lenses in quartzite. Associated minerals are: sanbornite, gillespite, quartz, titantaramellite, anandite and kinoshitalite. The fencooperite occurs in black aggregates which also contain celsian, alforsite, barite, sanbornite, quartz, pyrrhotite and diopside.

General appearance: Anhedral to roundish to platy grains (up to 100 [micro]m).

Physical, chemical and crystallographic properties: Luster: vitreous to adamantine. Diaphaneity: opaque to translucent, Color: jet black to dirty gray-brown (on very thin edges). Streak: grayish black. Luminescence: nonfluorescent. Hardness: [VHN.sub.10] 321 kg/[mm.sup.2], Mohs 4 1/2 to 5. Tenacity: brittle. Cleavage: none obvious. Fracture: uneven to subconchoidal. Density: could not be measured, 4.21 g/[cm.sup.3] (calc.). Crystallography: Trigonal, P3m1, a 10.74, c 7.095 A, V 708.7 [A.sup.3], Z 1, ca = 0.6606. Morphology: no forms were observed. Twinning: none observed. X-ray powder diffraction data: 3.892 (100) (201), 3.t48 (40) (211), 2.820 (90) (202), 2.685 (80) (220), 2.329 (30) (302,400), 2.208 (40) (401), 2.136(40) (222), 2.106(30) (203). Optical data: Uniaxial (-), [omega] 1.723, [epsilon] 1.711, strong pleochroism O = blue black, E = light greenish gray. Chemical analytical data: Means of twelve sets of electron microprobe data: BaO 50.51, MnO 0.15, [Al.sub.2][O.sub.3] 1.35, [Fe.sub.2][O.sub.3] 12.7 7, [P.sub.2][O.sub.5] 0.16, [H.sub.2]O (0.98), [CO.sub.2] (4.81), Cl 3.23, sum 101.34, less O = Cl 0.73, Total (100.61) wt.%. The valence of Fe and amounts of [H.sub.2]O and [CO.sub.2] were determined from the crystal structure analysis. Empirical formula: [Ba.sub.5.89][([Fe.sup.3+.sub.2.86][Mn.sub.0.04]).sub.[SIGMA]2.90][([ Si.sub.8.14][Al.sub.0.47][P.sub.0.04]).sub.[SIGMA]8.65][O.sub.23 18][([CO.sub.3]).sub.1.95][([Cl.sub.1.63][O.sub.1.37]).sub.[SIGMA]3.0 0].0.97[H.sub.2]O. Relationship to other species: None apparent.

Name: For Joseph Fenimore ("Fen") Cooper, Jr. (1937-), of Santa Cruz, California, who helped collect the samples containing the mineral. Comments: IMA No. 2000-023.

ROBERTS, A. C., GRICE, J. D., DUNNING, G. E., and VENANCE, K, E. (2001) Fencooperite, [Ba.sub.6][Fe.sup.3+.sub.3][Si.sub.8][O.sub.23][([CO.sub.3]).sub.2][C l.sub.3].[H.sub.2]O, a new mineral species from Trumbull Peak, Mariposa County, California. Canadian Mineralogist 39, 1059-1064. GRICE, J. D. (2001) The crystal structure of fencooperite: unique [[Fe.sup.3+.sub.3][O.sub.13]] pinwheels cross-connected by [[Si.sub.8][O.sub.22]] islands. Canadian Mineralogist 39, 1065-1071.

Kampfite

Hexagonal

[Ba.sub.6][[(Si,Al)[O.sub.2]].sub.8][([CO.sub.3]).sub.2][Cl.sub.2][(C l,[H.sub.2]O).sub.2]

Locality: Esquire #1 claim, Rush Creek, eastern Fresno County, California, USA (NE1/4 NW1/4 Section 16, T11S, R25E, Mount Diablo Meridian, Lat. 37[degrees]05' N, Long. 119[degrees]16'20" W). Kampfite has been found also at the Esquire #7 claim, along Big Creek, Fresno County, California, USA (SE1/4 SE1/4 Section 27, T11S, R25E, Mount Diablo Meridian, Lat. 36[degrees]56'40" N, Long. 190[degrees]14'28" W).

Occurrence: In a quartz-sanbornite outcrop. Associated minerals are: celsian, fresnoite, macdonaldite, pyrrhotite, titantaramellite, traskite, witherite, two new minerals and a hydrated form of Si[O.sub.2].

General appearance: Irregular masses up to 1 cm.

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: translucent. Color: light blue-gray. Streak: white. Luminescence: nonfluorescent. Hardness: 3. Tenacity: brittle. Cleavage: {00l} well-developed. Fracture: uneven. Density. could not be measured because of the presence of numerous inclusions, 3.51 g/[cm.sup.3] (calc.). Crystallography: Hexagonal, [P6.sub.3]/mmc, P62c, [P6.sub.3]mc, [P3.sub.1]c or [P3.sub.1]c. a 5.244, c 29.83 A, V 710.5 [A.sup.3], Z 1, c:a = 5.6884. Morphology: no forms were observed . Twinning: none observed. X-ray powder diffraction data: 14.67 (100) (002), 3.883 (100) (104), 3.357 (50) (106), 2.988 (60) (00.10), 2.887 (50) (108), 2.616 (70) (110), 1.969 (50) (1.1.10). Optical data: Uniaxial (-), [omega] 1.642, [epsilon] 1.594, nonpleochroic. One grain is biaxial (-), [alpha] 1.641, [beta] 1.642, [gamma](calc.) 1.642, 2V(meas.) 20[degrees], dispersion r<v slight. Chemical analytical data: Means of three sets of electron microprobe data (with [CO.sub.2] and [H.sub.2]O calculated by stoichiometry): [Na.sub.2]O 0.08, CaO 0.06, BaO 57.72, [Al.sub.2][O.sub.3] 7.76, [CO.sub.2] (5.69), Si[O.sub.2] 20.14, [H.sub.2]O (1.16), Cl 5.60, sum 98.21, less O = Cl 1.27, Total (96.94) wt.%. Empirical formula: [([Ba.sub.5.83][Na.sub.0.04][Ca.sub.0.02]).sub.[SIGMA]5.89][[([Si.sub .5.19][Al.sub.2.36]).sub.[SIGMA]7.55][O.sub.15.08]][([CO.sub.3]).sub. 2.00][Cl.sub.2.00][[[([H.sub.2]O).sub.1.00][Cl.sub.0.45]].sub.[SIGMA] 1.45]. Relationship to other species: The only other barium silicate carbonate mineral is fencooperite, [Ba.sub.6][Fe.sup.3+.sub.3][Si.sub.8][O.sub.23][([CO.sub.3]).sub.2][C l.sub.3].[H.sub.2]O.

Name: For Dr Anthony Robert Kampf (1948-), Curator and Section Head of Minerals, Los Angeles County Museum of Natural History, for his many contributions to the crystallographic study of new and rare minerals. Comments: IMA No. 2000-003.

BASCIANO, L. C., GROAT, L. A., ROBERTS, A. C., GRICE, J. D., DUNNING, G. E., FOORD, E. E., KJARSGAARD, I. M., and WALSTROM, R. E. (2001) Kampfite, a new barium silicate carbonate mineral species from Fresno County, California. Canadian Mineralogist 86, 1053-1058.

Krettnichite

Monoclinic

Pb[Mn.sup.3+.sub.2][([VO.sub.4]).sub.2][(OH).sub.2]

Locality: Dumps of the manganite deposit at Krettnich, Saarland, Germany.

Occurrence: In vugs in a hydrothermal manganite-quartz vein. Associated minerals are: manganite, quartz, barite, ankerite, mottramite barian brackebuschite and cuprian-cobaltoan pyrobelonite.

General appearance: Radiating aggregates (up to 3 cm in diameter) of platy crystals (less than 1 mm).

Physical, chemical and crystallographic properties: Luster: adamantine. Diaphaneity: transparent in thin cleavage plates. Color: brown to black with orange-red internal reflections. Streak: brown. Luminescence: nonfluorescent. Hardness: [VHN.sub.100] 276 kg/[mm.sup.2] [perpendicular to] (001), 347 kg/[mm.sup.2] \ (001), Mohs 4 1/2. Tenacity: not given. Cleavage: (001} excellent and another at a high angle to {001} distinct. Fracture: not given. Density: could not be measured but the mineral sinks in Clerici solution (D = 4.04 g/[cm.sup.3]), 4.75 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, C2/m, a 9.275, b 6.284, c 7.682 A, [beta] 117.97[degrees], V395.4 [A.sup.3], Z 2, a:b:c = 1.4760:1:1.2225. Morphology: {001},{111}, {332} and {331}; pseudo-rhombohedral. Twinning: polysynthetic on (001). X-ray powder diffraction data: 4.695 (34) (111), 3.388 (95) (002), 3.270 (100) (112), 2.946 (51) (201), 2.850 (49) (021), 2.4910 (93) (310, 220), 1.8693 (35) (113), 1.6970 (83) (004). Optical data: In reflected light: reddish brown, strong anisotropism but rotation tints are not very colorful; distinct bireflectance, slight pleochroism. [R.sub.1], [R.sub.2]; [[blank].sup.im][R.sub.1], [[blank].sup.im][R.s ub.2]: (15.8, 19.2; 4.35, 6.45 %) 470nm, (14.8, 17.8; 3.79, 5.67 %) 546nm, (14.4, 17.3; 3.63, 5.35 %) 590nm, (14.1, 16.8; 3.48, 5.06 %) 650nm. Calculated indices of refraction are: [n.sub.1] 2.21, [n.sub.2] 2.39 for light of 590nm wavelength. Chemical analytical data: Means of fifty-four sets of electron microprobe data: CaO 0.60, NiO 0.04, CoO 2.22, CuO 0.42, SrO 1.48, BaO 0.90, PhO 32.66, [Al.sub.2][O.sub.3] 0.04, [Mn.sub.2][O.sub.3] 24.03, [Fe.sub.2][O.sub.3] 1.25, [V.sub.2][O.sub.5] 29.26, [As.sub.2][O.sub.5] 2.92, [H.sub.2]O 3.54, Total 99.36 wt.% (given as 99.43). Empirical formula: [([Pb.sub.0.83][Co.sub.0.17][Sr.sub.0.08][Ca.sub.0.06][Ba.sub.0.03][C u.sub.0.03]).sub.[SIGMA]1.20][([Mn.sub.1.73][Fe.sub.0.09]).sub.[SIGMA ]1.82][[([V.sub.1.86][As.sub.0.14])[O.sub.4]].sub.1.97][(OH).sub.2.23 ]. The empirical formula has an excess -0.28 charge. Relationship to other species: It is a member of the tsumcorite group and the [Mn.sup.3+]-dominant analogue of mounanaite, Pb[Fe.sup.3+.sub.2][([VO.sub.4]).sub.2][(OH).sub.2].

Name: For the locality. Comments: IMA No. 1998-044. The crystal drawing in the paper is not in a standard orientation so it has been redrawn here.

BRUGGER, J., ARMBRUSTER, T., CRIDDLE, A., BERLEPSCH, P., GRAESER, S., and REEVES, S. (2001) Description, crystal structure, and paragenesis of krettnichite, Pb[Mn.sup.3+.sub.2][([VO.sub.4]).sub.2][(OH).sub.2], the [Mn.sup.3+] analogue of mounanaite. European Journal of Mineralogy 13, 145-158.

Levinsonite-(Y)

Monoclinic

(Y,Nd,Ce)Al[([SO.sub.4]).sub.2]([C.sub.2][O.sub.4]).12[H.sub.2]O

Locality: Alum Cave Bluff, Great Smoky Mountains National Park, Tennessee, USA.

Occurrence: In an evaporite assemblage. Associated minerals are: coskrenite-(Ce), zugshunstite-(Ce), melanterite, halotrichite, pickeringite, apjohnite, epsomite and other hydrated sulfates.

General appearance: Individual euhedral prismatic crystals or groups of five to ten randomly oriented crystals (up to approximately 1 mm long).

Physical chemical and crystallographic properties: Luster: not given but probably vitreous. Diaphaneity: transparent. Color: colorless. Streak: white. Luminescence: none observed. Hardness: not determined. Tenacity: brittle. Cleavage: {101} perfect. Fracture: irregular. Other properties: soluble in [H.sub.2]O. Density: not determined, 2.18 g/[cm.sup.3] (calc.). Crystallography: Monodinic, P2/n, a 10.289, b 9.234, c 11.015 A, [beta] 108.50[degrees], V992.5 [A.sup.3], Z 2, a:b:c 1.1143:1:1.1929. Morphology: {101}, {010}, {101}, prismatic along [101] and flattened on {101}. Note: The third form is given by the authors as {101} but probably is {101}. Twinning: none mentioned. X-ray powder diffraction data: 9.3 (100) (010), 6.28 (90) (101), 5.20 (40) (111), 4.89 (60) (200), 4.63 (30) (112), 4.09 (50) (121), 3.700 (30) (112, 121, 103), 3.447 (30) (022, 301, 113), 2.867 (30) (301, 113), 2.747 (30) (131, 321, 313, 223, 311), 2.518 (30) (402, 014, 123, 232). Optical data: Biaxial (sign not given but +), [alpha] 1.48, [beta] 1.49, [gamma] 1.55, 2V(meas.) 7[degrees], 2V(calc.) 46[degrees]; dispersion none observed; nonpleochroic; X ~ c, Y = b, Z ^ c given as 19[degrees], but this must be Z ^ a = 19[degrees] (in obtuse angle [beta]). Chemical analytical data: Means of an unstated number of sets of electron microprobe data: [Y.sub.2][O.sub.3] 5.72, [La.sub.2][O.sub.3] 0.50, [Ce.sub.2][O.sub.3] 3.02, [Pr.sub.2][O.sub.3] 0.76, [Nd.sub.2][O.sub.3] 5.94, [Sm.sub.2][O.sub.3] 3.21, [Eu.sub.2][O.sub.3] 0.54, [Gd.sub.2][O.sub.3] 2.23, [Dy.sub.2][O.sub.3] 1.15, [Er.sub.2][O.sub.3] 0.29, [Al.sub.2][O.sub.3] 7.83, [SO.sub.3] 24.58, [C.sub.2][O.sub.3] (11.05), [H.sub.2]O (33.18), Total (100.00) wt.%. [C.sub.2][O.sub.3] and [H.sub.2]O were calculated to give 1.00([C.sub.2][O.sub.4]) and 12([H.sub.2]O), respectively. Empirical formula: [([Y.sub.0.33][Nd.sub.0.23][Ce.sub.0.12][Sm.sub.0.12][Gd.sub.0.08][Dy .sub.0.04][Pr.sub.0.03][La.sub.0.02][Eu.sub.0.02][Er.sub.0.01]).sub.[ SIGMA]1.00][Al.sub.1.00][([SO.sub.4]).sub.2.00][([C.sub.2][O.sub.4]). sub.1.00].12.00[H.sub.2]O. Relationship to other species: None stated.

Name: For Prof. A. A. Levinson (1927-), University of Calgary (Alberta, Canada), originator of the internationally used nomenclature for rare earth element minerals. Comments: [MA No. 1996-057.

ROUSE, R. C., PEACOR, D. R., ESSENE, E. J., COSKREN, T. D., and LAUF, R. J. (2001) The new minerals levinsonite-(Y) [(Y,Nd,Ce)Al[([SO.sub.4]).sub.2]([C.sub.2][O.sub.4])*12[H.sub.2]O] and zugshunstite-(Ce) [(Ce,Nd,La)Al[([SO.sub.4]).sub.2]([C.sub.2][O.sub.4])*12[H.sub.2]O]: Coexisting oxalates with different structures and differentiation of LREE and HREE. Geochimica et Cosmochimica Acta 65, 1101-1115.

Lisitsynite

Orthorhombic

KB[Si.sub.2][O.sub.6]

Locality: Koashva quarry, Khibina alkaline massif, Kola Peninsula, Russia.

Occurrence: In an intensely mineralized pipe-like pegmatite body intruded into ijolite-urtite along its contact with an apatitenepheilne rock. Associated minerals are: potassium feldspar, sodalite, cancrinite, pectolite, aegirine, natrite, vililaumite, lomonosovite, chkalovite, nacaphite, fluorcaphite, vitusite, sphalerite and galena.

General appearance: Irregularly shaped grains and subhedral tabular crystals (0.2 to 0.5 mm across).

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: transparent. Color: colorless. Streak: white. Luminescence: fluoresces bright pink under short-wave ultraviolet light. Hardness: 5 to 6. Tenacity: brittle. Cleavage: {010} good. Fracture: subconchoidal. Density: 2.74 g/[cm.sup.3] (meas.), 2.75 g/[cm.sup.3] (calc.). Crystallography: Orthorhombic, [P2.sub.1][2.sub.1][2.sub.1], a 9.9630, b 10.4348, c 4.7044 A, V 489.08 [A.sup.3], Z 4, a:b:c = 0.9548:1:0.4508. Morphology: {010} and {110}. Twinning: none mentioned. X-ray powder diffraction data: 3.944 (5) (111), 3.495 (8) (021), 3.282 (10) (121, 130), 3.149 (4) (310), 2.704 (4) (301, 131), 2.293 (4) (012, 102). Optical data: Biaxial (-), [alpha] 1.561, [beta] 1.563, [gamma] 1.564, 2V(meas.) 51[degrees], 2V(calc.) 70[degrees]; dispersion r>v, strong; nonpleochroic; orientation, X = a, Y = b, Z = c. Chemical analytical data: Means of five sets of electron microprobe data: [Na.sub.2]O 0.00, [K.sub.2]O 23.50, [B.sub.2][O.sub.3] 17.17, Si[O.sub.2] 58.94, Total 99.61 wt.%. Empirical formula: [K.sub.1.01][B.sub.1.00][Si.sub.1.99][O.sub.6.00]. Relationship to other species: None apparent.

Name: For Apollon E. Lisitsyn (1928-1999), well-known Russian specialist in the mineral resources, geology and mineralogy of boron deposits. Comments: IMA No. 2000-008.

KHOMYAKOV, A. P., NECHELYUSTOV, G. N., SOKOLOVA, E. V., and HAWTHORNE, F. C. (2000) New borosilicates: malinkoite, NaBSi[O.sub.4], and lisitsynite, [KBSi.sub.2][O.sub.6], from alkaline pegmatites of the Khibiny-Lovozero complex, Kola Peninsula. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva 129(6), 35-42.

Londonite

Cubic

(Cs,K,Rb)[Al.sub.4][Be.sub.4][(B,Be).sub.12][O.sub.28]

Locality: The type locality is Antandrokomby pegmatite, near Mt Ibity, south of the Sahatany Valley, Madagascar. Also from the Ampanivana and Antsongombato pegmatites.

Occurrence: In the pocket zone of the pegmatite. Associated minerals are: quartz, albite, red tourmaline, microcline and danburite.

General appearance: Two well-formed crystals 1 cm across (type locality). Also up to 7 cm across at Antsongombato.

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: translucent to transparent. Color: milky white to yellow. Streak: white. Luminescence: weak yellow-green fluorescence under short-wave ultraviolet light. Hardness: 8. Tenacity. brittle. Cleavage: none. Fracture: conchoidal. Density: 3.34 g/[cm.sup.3] (meas.), 3.42 g/[cm.sup.3] (calc.). Crystallography: Cubic, P43m, a 7.3205 A, V 392.30 [A.sup.3], Z 1. Morphology: dodecahedron {110}, tristetrahedron {211}, tetrahedron (111}, deltoid dodecahedron (221} and rare cube (100}. Twinning: none mentioned. X-ray powder diffraction data: 7.320 (20) (100), 3.274 (50) (210), 2.9898 (100) (211), 2.4410 (50) (300, 221), 2.2072 (20) (311), 2.1132 (35) (222), 1.9565 (20) (321), 1.8301 (20) (400), 1.7755 (25) (410, 322). Optical data: Isotropic, n 1.693. Chemical analytical data: Means of five sets of electron microprobe data (with BeO and [B.sub.2][O.sub.3] calculated to give 5.00 Be and 11.00 B, respectively): [Li.sub.2]O 0.04, [Na.sub.2]O 0.1 1, [K.sub.2]O 2.21, [Cs.sub.2]O 8.37, [Rb.sub.2]O 1.04, BeO (15.49), MgO nd., CaO 0.14, MnO 0.05, [B.sub.2][O.sub.3] ((47.39), [Al.sub.2][O.sub.3] 25.10, [Fe.sub.2][O.sub.3] 0.06, Si[O.sub.2] 0.07, Total (100.07) wt.%. Empirical formula: [([Cs.sub.0.48][K.sub.0.38][Rb.sub.0.09][Na.sub.0.03][Ca.sub.0.02][Mn .sub.0.01]).sub.[SIGMA]1.01][([Al.sub.3.97][Li.sub.0.02][Fe.sub.0.01] ).sub.[SIGMA]4.00][Be.sub.4.00][[[([B.sub.10.99][Si.sub.0.01]).sub.[S IGMA]11.00][Be.sub.1.00]].sub.[SIGMA]12.00][O.sub.28.00]. Relationship to other species: It is the Cs-dominant analogue of rhodizite, (K,Cs)[Al.sub.4][Be.sub.4][(B,Be).sub.12][O.sub.28].

Name: For Dr. David London (1953-), Professor of Geology and Geophysics at the University of Oklahoma. Comments: IMA No. 1999-014.

SIMMONS, W. B., PEZZOTTA, F., FALSTER, A. U., and WEBBER, K. L. (2001) Londonite, a new mineral species: the Cs-dominant analogue of rhodizite from the Antandrokomby granitic pegmatite, Madagascar. Canadian Mineralogist 39, 747-755.

Malinkoite

Hexagonal

NaBSi[O.sub.4]

Locality: Mount Karnasurt, Lovozero alkaline massif, Kola Peninsula, Russia.

Occurrence: In an intensely mineralized hyperagpaitic pegmatite intruded into foyaite. Associated minerals are: ussingite, chkalovite, nordite, gerasimovskite and neptunite.

General appearance: Rosette-like intergrowths of wedge-shaped crystals and spherulites (up to 3 mm across).

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: transparent to slightly turbid. Color: colorless, pale pink or greenish-blue. Streak: white. Luminescence: fluoresces dull pinkish lilac under short-wave and bright greenish yellow under long-wave ultraviolet light. Hardness: 5. Tenacity: brittle. Cleavage: {h00} and {001} good. Fracture: uneven to splintery. Density: 2.90 g/[cm.sup.3] (meas.), 2.92 g/[cm.sup.3] (calc.). Crystallography: Hexagonal, [P6.sub.3], a 13.8964, c 7.7001 A, V 1287.8 [A.sup.3], Z 18, c:a = 0.5541. Morphology: {h00} and {001}. Twinning: none mentioned. X-ray powder diffraction data: 3.86 (6) (002), 3.61 (6) (012), 2.780 (10) (032), 2.320 (7) (330), 2.216 (9) (331), 1.928 (5) (250), 1.721 (7) (333). Optical data: Uniaxial (-), [omega] to 1.591, [epsilon] 1.582, nonpleochroic. The abstract of the paper states that the mineral is biaxial (-) but it is clearly uniaxial (-). Chemical analytical data: Means of seven sets of electron microprobe data: [Na.sub.2]O 24.36, [K.sub.2]O 0.00, [B.sub.2][O.sub.3] 26.88, Si[O.sub.2] 47.83, Total 99.07 wt.%. Empirical formula: [Na.sub.1.00][B.sub.0.98][Si.sub.1.01][O.sub.4.00]. Relationship to other species: It has some structural similarities to kalsilite, KAlSi[O.sub.4], and beryllonite, NaBeP[O.sub.4].

Name: For Svetlana V. Malinko (1927-), well-known Russian mineralogist and discoverer of many boron minerals. Comments: IMA No. 2000-009. The crystal structure has been solved.

KHOMYAKOV, A. P., NECHELYUSTOV, G. N., SOKOLOVA, E. V., and HAWTHORNE, F. C. (2000) New borosilicates: malinkoite, NaBSi[O.sub.4], and lisitsynite, KB[Si.sub.2][O.sub.6], from alkaline pegmatites of the Khibiny-Lovozero complex, Kola Peninsula. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva 129(6), 35-42.

Micheelsenite

Hexagonal

[(Ca,Y).sub.3]Al([PO.sub.3]OH,[CO.sub.3])([CO.sub.3])[(OH).sub.6].12[ H.sub.2]O

Locality: The Poudrette quarry, Mont Saint-Hilaire, Rouville County, Quebec, Canada and the Nanna pegmatite, Narsaarsuup Qaava, South Greenland.

Occurrence: Associated minerals at Mont Saint-Hilaire are: aegirine, albite, ancylite-(Ce), catapleiite, fluorite, microcline, monteregianite-(Y), natrolite, nenadkevichite, rhodochrosite and serandite in pegmatites; and natrolite, titanite, calcite and pyrite in hornfels. Associated minerals at Nanna are aegirine, astrophyllite, analcime, calcio-ancylite-(Ce), catapleiite, fluorite, galena, gibbsite, leucophanite, microcline, natrolite, nafertisite, orthoclase, polylithionite, sodalite (var. hackmanite) and todorokite.

General appearance: Acicular to fibrous crystals (up to 2 mm long) in loosely packed radiating groups (up to 3 mm in diameter) and as matted fibers. Also as rounded plates 0.6 mm in diameter and 0.1 mm thick.

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: transparent to translucent. Color: white to colorless. Streak: white. Luminescence: nonfluorescent. Hardness: 3 1/2 to 4. Tenacity: brittle. Cleavage: {100} and {001} good. Fracture: splintery. Density: 2.15 g/[cm.sup.3] (meas.), 2.17 g/[cm.sup.3] (calc.). Crystallography: Hexagonal, [P6.sub.3], a 10.828, c 10.516 A, V 1067.8 [A.sup.3], Z2, c:a = 0.9712. Morphology: {001} and probably {100}. Twinning: none mentioned. X-ray powder diffraction data: 9.38 (100) (100), 4.82 (40) (111), 4.59 (70) (102), 3.77 (50) (112), 3.36 (55) (211), 2.691 (45) (302), 2.491 (80) (213), 2.143 (65) (223). Optical data: Uniaxial (-), [omega] 1.532, [epsilon] 1.503, nonpleochroic. Chemical analytical data: Means of three sets of electron microprobe data: CaO 16.90, [Al.sub.2][O.sub.3] 6.70, [Y.sub.2][O.sub.3] 18.07, [Gd.sub.2][O.sub.3] 0.84, [Dy.sub.2][O.sub.3] 2.65, [Ho.sub.2][O.sub.3] 0.51, [Er.sub.2][O.sub.3] 1.88, Si[O.sub.2] 0.07, [P.sub.2][O.sub.5] 7.80, [SO.sub.3] 0.53, [CO.sub.2] (8.38), [H.sub.2]O (43.01), Total (107.34) wt.%. [CO.sub.2] and [H.sub.2]O were indicated by infrared and structural data and their amounts were calculated from the stoichiometry. Empirical formula: [([Ca.sub.1.96][Y.sub.1.04][Dy.sub.0.09][Er.sub.0.06][Gd.sub.0.03][Ho .sub.0.02]).sub.[SIGMA]3.20][Al.sub.0.85][[([P.sub.0.71][C.sub.0.24][ S.sub.0.04][Si.sub.0.01]).sub.[SIGMA]1.00][O.sub.3.00][(OH).sub.1.00] ]([CO.sub.3])[(OH).sub.6.00]. Relationship to other species: A member of the ettringite group.

Name: For Dr. H. I. Micheelsen (1931-), Professor Emeritus, University of Copenhagen, Denmark. Dr. Micheelsen discovered the Nanna pegmatite in 1963. Comments: IMA No. 1999-033. The crystal structure has been solved.

MCDONALD, A. M., PETERSEN, O. V., GAULT, R. A., JOHNSEN, O., NIEDERMAYR, G., BRANDSTATTER, F., and GIESTER, G. (2001) Micheelsenite, [(Ca,Y).sub.3]Al([PO.sub.3]OH,[CO.sub.3])([CO.sub.3])[(OH).sub.6].12[ H.sub.2]O, a new mineral from Mont Saint-Hilaire, Quebec, Canada and the Nanna pegmatite, Narsaarsuup Qaava, South Greenland. Neues Jahrbuch fur Mineralogie, Monatshefte 2001, 337-351.

Orthojoaquinite-(La)

Orthorhombic

[Ba.sub.2]Na[La.sub.2][Fe.sup.2+][Ti.sub.2][Si.sub.8][O.sub.26](O,OH) .[H.sub.2]O

Locality: The Ilimaussaq alkaline complex, on the right bank of the Narsaq River at the foot of Kvansfjeld Mountain, south Greenland.

Occurrence: In the intermediate zone of nepheline-syenite pegmatites. Associated minerals are: riebeckite, analcime, sodalite and steenstrupine-(Ce).

General appearance: Banded gneissic masses (up to 4 x 3 x 1 cm) consisting of bent flakes 1 mm long.

Physical, chemical and crystallographic properties: Luster: silky. Diaphaneity: transparent. Color: brown. Streak: unknown. Luminescence: not reported. Hardness: VHN 350-430 kg/[mm.sup.2], Mohs about 5. Tenacity: unknown,, probably brittle. Cleavage: {001} good. Fracture: not given. Density: 4.1 g/[cm.sup.3] (meas.), 4.14 g/[cm.sup.3] (calc.). Crystallography: Orthorhombic, Ccmm, a 10.539, b 9.680, c 22.345 A, V 2280 [A.sup.3], Z 4, a:b:c = 1.0887:1:2.3084. Morphology: no forms were mentioned. Twinning: none mentioned. X-ray powder diffraction data: 5.58 (67.5) (004), 3.00 (8.8) (224), 2.95 (17.0) (206), 2.91 (10.5) (117), 2.80 (100) (313, 008, 225), 2.232 (7.5) (0.0.10), 1.596 (12.8) (0.0.14,602). Optical data: Biaxial (+), [alpha] 1.754, [beta] 1.760, [gamma] 1.797, 2V(meas.) 40[degrees], 2V(calc.) 45[degrees]; dispersion not given; pleochroism strong, Z > X; orientation, Z = c. Chemical analytical data: A wet chemical analysis gave: [Na.sub.2]O 2.41, [K.sub.2]O 0.22, CaO (+ SrO) 0.03, MnO 0.70, FeO 4.78, B aO 21.46, [Fe.sub.2][O.sub.3] 0.39, [La.sub.2][O.sub.3] 10.02, [Ce.sub.2][O.sub.3] 9.40, [Pr.sub.2][O.sub.3] 0.99, [Nd.sub.2][O.sub.3] 2.15, Si[O.sub.2] 33.82, Ti[O.sub.2] 9.20, Th[O.sub.2] 0.38, [Nb.sub.2][O.sub.5] 2.31, [H.sub.2]O 1.50, F 0.38, sum 100.17, less O = F 0.16, Total 100.01 wt.%. Empirical formula: [([Ba.sub.1.99][Ca.sub.0.01]).sub.[SIGMA]2.00][([Na.sub.1.11][K.sub.0 .07]).sub.[SIGMA]1.18][([La.sub.0.88][Ce.sub.0.81][Nd.sub.0.18][Pr.su b.0.09]).sub.[SIGMA]1.96][([Fe.sup.2+.sub.0.95][Mn.sub.0.14]).sub.[SI GMA]1.09][([Ti.sub.1.64][Nb.sub.0.25][Fe.sup.3+.sub.0.07][Th.sub.0.02 ]).sub.[SIGMA]1.98][Si.sub.8.01][O.sub.26.00][[[(OH).sub.0.37][O.sub. 0.35][F.sub.0.28]].sub.[SIGMA]1.00].1.00[H.sub.2]O. Relationship to other species: A member of the joaquinite group.

Name: For the relationship to other members of the joaquinite group. Comments: IMA No. 00-D.

MATSUBARA, S., MANDARINO, J. A., and SEMENOV, E. I. (2001) Redefinition of a mineral in the joaquinite group: orthojoaquinite-(La). Canadian Mineralogist 39, 757-760.

Petterdite

Orthorhombic

Pb[Cr.sub.2][([CO.sub.3]).sub.2][(OH).sub.4].[H.sub.2]O

Locality: The Red Lead mine, Zeehan-Dundas region (Lat. 41[degrees]53' S, Long. 145[degrees]25' E), northwestern Tasmania, Australia. It also occurs at the Callenberg Nord-1 open cut, near Glauchau, Saxony, Germany.

Occurrence: Associated minerals are: galena, goethite, anglesite, and crocoite. At the German locality, petterdite is associated with crocoite, cerussite, bindheimite, pyromorphite and galena.

General appearance: As thin (up to 0.5 mm) crusts composed of thin, roughly rectangular, platy crystals up to 15 [micro]m across.

Physical, chemical and crystallographic properties: Luster: earthy to pearly. Diaphaneity: translucent. Color: pale grayish to pinkish violet. Streak: pale violet. Luminescence: nonfluorescent. Hardness: could not be measured but is assumed to be about 2. Tenacity: could not be observed. Cleavage: {100} fair, possibly also {010}. Fracture: could not be observed. Density: could not be measured because of the high porosity of the aggregates, 3.95 g/[cm.sup.3] (calc.). Crystallography: Orthorhombic, space group not determined but assumed to be Pbnm by analogy with dundasite, a 9.079, b 16.321, c 5.786 A, V 857 [A.sup.3], Z 4, a:b:c = 0.5563:1:0.3545. Morphology: {010}, flattened on {010} and slightly elongate on [001] or less commonly on [100]. Twinning: none observed. X-ray powder diffraction data: 7.937 (100) (110), 4.686 (50b) (021, 111), 3.633 (70) (131), 3.270 (40) (221), 2.718 (40) (022, 060, 112, 151), 2.690 (40) (241, 301); the broad spacing at 4.686 is resolved into two lines at 4.73 and 4.67 with an au tomated diffractometer. Optical data: Biaxial (-), [alpha] 1.740, [beta] [approximately equal to] 1.802, [gamma] 1.842, 2V could not be measured, 2V(calc.) approximately 62[degrees]; dispersion not given; pleochroism X = Y colorless to pale grayish pink, Z grayish pink; orientation, X = a, Y = b, Z = c. Chemical analytical data: Means of four sets of electron microprobe data ([H.sub.2]O calculated by difference): PbO 43.13, SrO 1.40, [Al.sub.2][O.sub.3] 3.65, [Cr.sub.2][O.sub.3] 22.64, [Sb.sub.2][O.sub.5] 0.67, [CO.sub.2] 18.3, [H.sub.2]O (10.01), Total (100.00) wt.%. Empirical formula: [([Pb.sub.0.99][Sr.sub.0.07]).sub.[SIGMA]1.06][([Cr.sub.1.52][Al.sub. 0.36][Sb.sub.0.02]).sub.[SIGMA]1.90][([CO.sub.3]).sub.2.12][(OH).sub. 3.62].1.02[H.sub.2]O. Relationship to other species: It is the chromium-dominant analogue of dundasite, Pb[Al.sub.2][([CO.sub.3]).sub.2][(OH).sub.4].[H.sub.2]O.

Name: For William Frederick Petterd (1849-1910), an amateur collector who published several significant catalogues on the mineralogy of Tasmania. The name was once used for a phosphatian mimetite. Comments: IMA No. 1999-034.

BIRCH, W. D., KOLITSCH, U., WITZKE, T., NASDALA, L., and BOTTRILL, R. S. (2000) Petterdite, the Cr-dominant analogue of dundasite, a new mineral species from Dundas, Tasmania, Australia and Callenberg, Saxony, Germany. Canadian Mineralogist 38, 1467-1476.

Phosphoellenbergerite

Hexagonal

[Mg.sub.14][([PO.sub.4]).sub.6][([PO.sub.3]OH,[CO.sub.3]).sub.2][(OH) .sub.6]

Locality: Parigi, Val Varaita, southern Dora-Maira massif, western Alps, Italy. Tingelstadtjern serpentine-magnesite deposit, Modum, southern Norway.

Occurrence: As inclusions in fist-sized pyrope megablasts in coesite-bearing pyrope-kyanite-phengite quartzite at the Italian locality; other associated minerals are: talc and rutile. At the Norwegian locality, the mineral occurs in lenses (up to 200 m long) in serpentine-magnesite rocks; other minerals found in these lenses are: althausite, holtedahlite, heneuite and a new mineral with the formula [Mg.sub.7][([PO.sub.4]).sub.2][(OH).sub.8] isostructural with allactite, [Mn.sub.7][(As[O.sub.4]).sub.2][(OH).sub.8].

General appearance: At the type locality, the mineral occurs as crystals (50 to 300 [micro]m) and as millimeter-size hexagonal prisms. The Norwegian material occurs as anhedral grains less than 0.5 mm.

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: transparent. Color: azure blue. Streak: white. Luminescence: nonfluorescent. Hardness: 6 1/2 (by analogy with ellenbergerite). Tenacity: brittle. Cleavage: none. Fracture: not given. Density: 3.0 g/[cm.sup.3] (meas.) (Norway), 2.94 g/[cm.sup.3] (calc.) (Norway), 2.97 g/[cm.sup.3] (calc.) (Italy). crystallography: Hexagonal, [P6.sub.3]mc, a 12.47, c 5.04 A, V 678 [A.sup.3], Z 1, c:a = 0.4042 (Italy); a 12.467, c 5.0437 A, V 678.9 [A.sup.3], Z 1, c:a = 0.4046 (Norway). Morphology: {100} and {001} (Italy). Twinning: none observed. X-ray powder diffraction data: 3.685 (100) (201), 3.170 (95) (211), 2.702 (80) (400), 2.381 (70) (401), 2.221 (80) (321), 1.555 (80) (213), 1.426 (80) (522) (Norway). Optical data: Uniaxial (-), [omega] 1.606, [epsilon] 1.588 and [omega] 1.609, [epsilon] 1.589 (both sets from Norway material), pleochroism O = colorless, E = blue. Chemical analytical data: Means of four sets of electron microprobe data f rom Norwegian material: MgO 44.4, GaO 0.5, FeO 1.0, Si[O.sub.2] 0.7, [P.sub.2][O.sub.5] 37.4, [As.sub.2][O.sub.5] 5.5, [SO.sub.3] 1.0, [CO.sub.2] (2.75), [H.sub.2]O (5.986), Total (99.236) wt.% ([CO.sub.2] and [H.sub.2]O were calculated). Empirical formula: [Mg.sub.12.00][([Mg.sub.1.32][Fe.sub.0.17][Ca.sub.0.11][[_not reproducible in ascii].sub.0.40]) .sub.[SIGMA]2.00][[[([PO.sub.4]).sub.4.34][([PO.sub.3]OH).sub.0.79][( As[O.sub.4]).sub.0.58][([SO.sub.4]).sub.0.15][(Si[O.sub.4]).sub.0.14] ].sub.[SIGMA]6.00][[[([PO.sub.3]OH).sub.1.24][([CO.sub.3]).sub.0.76]] .sub.[SIGMA]2.00][(OH).sub.6.00]. Electron microprobe data from Italian material: MgO 39.68, CaO 0.02, FeO 1.38, [Al.sub.2][O.sub.3] 4.16, [CO.sub.2] 2.00, Si[O.sub.2] 5.61, Zr[O.sub.2] 0.16, [P.sub.2][O.sub.5] 36.16, [As.sub.2][O.sub.5] 1.65, [SO.sub.3] 1.52, [H.sub.2]O 6.16, Total 98.50 wt.%. Empirical formula: [([Mg.sub.12.01][Al.sub.1.00][Fe.sub.0.23][Zr.sub.0.02]).sub.[SIGMA]1 3.26][([P.sub.6.21][Si.sub.1.14][S.sub.0.23][As.sub.0.18]).sub.[SIGMA ]7.76][O.sub.38.00][H.sub.8.34]. Relatio nship to other species: Chemically and structurally related to ellenbergerite, [Mg.sub.6]Ti[Al.sub.6][Si.sub.8][O.sub.28][(OH).sub.10].

Name: For the relationship with ellenbergerite. Comments: IMA No. 94-006. The formal description of the type material has not been published. Dr. Christian Chopin, the senior author of the IMA proposal, has kindly provided data from the type material for this abstract.

CHOPIN, C. (1984) Coesite and pure pyrope in high-grade blueschists of the Western alps: a first record and some consequences. Contributions to Mineralogy and Petrology 86, 106-118. CHOPIN, C., KLASKA, R., MEDENBACH, O., and DRON, D. (1986) Ellenbergerite, a new high-pressure Mg-Al(Ti,Zr)-silicate with a novel structure based on face-sharing octahedra. Contributions to Mineralogy and Petrology 92, 316-321. RAADE, G., ROMMING, C., and MEDENBACH, O. (1998) Carbonate-substituted phosphoellenbergerite from Modum, Norway: description and crystal structure. Mineralogy and Petrology 62, 89-101. SIMON, G. and CHOPIN, C. (2001) Enstatite-sapphirine crack-related assemblages in ultrahigh-pressure megablasts, Dora-Maira massif, western Alps. Contributions to Mineralogy and Petrology 140, 422-440.

Pillaite

Monoclinic

[Pb.sub.9][Sb.sub.10][S.sub.23]Cl[O.sub.0.5]

Locality: The Buca della Vena mine, Apuan Alps, northern Tuscany, Italy.

Occurrence: In thin, late calcite veins which cut a small Fe-Ba ore body and the phyllites and dolomitic limestones in which the deposit is hosted. Associated minerals are: scainiite, zinkenite, boulangerite, robinsonite, tintinaite, sorbyite and other incompletely characterized minerals, Other associated minerals are: sphalerite, cinnabar, galena, andorite, bournonite, tetrahedrite, chalcostibite, gersdorffite, barite, cerussite and stibiconite.

General appearance: Small acicular crystals (up to 1 cm long and 0.1 mm thick).

Physical, chemical and crystallographic properties: Luster: metallic. Diaphaneity: opaque. Color: black. Streak: black to dark brown. Hardness: [VHN.sub.50] 175 kg/[mm.sup.2]. Tenacity: brittle. Cleavage: nothing distinct. Fracture: irregular. Density: could not be determined because of the small size, 5.80 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, C2/m, a 49.65, b 4.150, c 21.91 A, [beta] 99.760, V 4449 [A.sup.3], Z 4, a:b:c = 11.9639:1:5.2795. Morphology: no forms were observed. Twinning: none mentioned. X-ray powder diffraction data: 4.14 (27) (205), 3.88 (20) (12.0.1), 3.621 (26) (406, 12.0.2), 3.548 (40) (12.0.4, 10.0.5), 3.480 (100) (206), 3.249 (24) (12.0.5), 2.956 (47) (515, 16.0.1, 12.0.6, 914), 2.780 (22) (13.1.0, 515). Optical data: In reflected light: color not given, weak anisotropism, weak bireflectance, nonpleochroic, rare red internal reflections. R, [R.sup.im]: (35.7, 20.10 %) 470nm, (34.2, 18.75 %) 550nm, (34.0, 17.60 %) 590nm, (32.7, 16.45 %) 650nm. Chemical analytical data: Means of 13 sets of electron microprobe data: Cu 0.16, Pb 49.07, Sb 30.36, 5 18.73, Cl 0.98, O 0.21, Total 99.51 wt.%. Empirical formula: [Pb.sub.9.25][Sb.sub.9.74][Cu.sub.0.10][S.sub.22.82][Cl.sub.1.08][O.s ub.051]. Relationship to other species: Related to zinkenite. Pillaite is unusual in having both Cl and O which play an essential role in the stability of its structure.

Name: For Prof. Leopoldo Pilla (1805-1848), one of the most important Italian vulcanologists and mineralogists of his time. Comments: IMA No. 1997-042.

ORLANDI, P., MOELO, Y, MEERSCHAUT, A., and PALVADEAU, P. (2001) Lead-antimony sulfosalts from Tuscany (Italy). III. Pillaite, [Pb.sub.9][Sb.sub.10][S.sub.23]Cl[O.sub.0.5], a new Pb-Sb oxy-chloro-sulfosalt, from Buca della Vena mine. European Journal of Mineralogy 13, 605-610.

Polyakovite-(Ce)

Monoclinic

[(Ce,Ca).sub.4](Mg,[Fe.sup.2+])[([Cr.sup.3+],[Fe.sup.3+]).sub.2][(Ti, Nb).sub.2][Si.sub.4][O.sub.22]

Locality: Mine N97, Ilmen Natural Reserve, southern Urals, Russia (Lat. 55[degrees]01' N, Long. 11[degrees] E).

Occurrence: In a carbonatite vein. Associated minerals are: dolomite, fluororichterite, chromite, thorianite, forsterite and phlogopite.

General appearance: Anhedral equant grains usually 0.5 to 0.7 cm, but up to 2.5 cm, and as euhedral crystals up to 2 mm.

Physical, chemical and crystallographic properties: Luster: given as vitreous, but the optical data indicate adamantine. Diaphaneity: translucent in thin fragments. Color: black. Streak: brown. Luminescence: nonfluorescent. Hardness: [VHN.sub.200] 874 kg/[mm.sup.2], Mohs 5 1/2 to 6. Tenacity: brittle. Cleavage: none. Fracture: conchoidal. Density: 4.75 g/[cm.sup.3] (meas.), 5.05 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, C2/m, a 13.395, b 5.698, c 11.040 A, [beta] 100.55[degrees], V 828.5 [A.sup.3], Z 2, a:b:c = 2.3508:1:1.9375. Morphology: {100}, {001}, {201}, {201}, {110}, {111}, {111}, {112}, {112}, {302}. Twinning: none mentioned. X-ray powder diffraction data: 5.44 (40) (002), 3.62 (35) (003), 3.18 (50) (311), 3.15 (40) (312), 3.12 (35) (113), 2.849 (40) (020), 2.715 (100) (004), 2.160 (45) (421). Optical data: Isotropic (due to metamictization), n between 1.931 and 1.935. In reflected light: gray, nonpleochroic. R: (11.1 %) 480nm, (10.9 %) 540nm, (10.8 %) 580nm, (10.5 %) 640nm. Chemical analytical data: Means of three sets of electron microprobe data and one set of wet chemical data: MgO 2.61, CaO 1.06, MnO 0.05, FeO 1.09, [Cr.sub.2][O.sub.3] 7.42, [Fe.sub.2][O.sub.3] 4.30, [Y.sub.2][O.sub.3] 0.38, [La.sub.2][O.sub.3] 15.94, [Ce.sub.2][O.sub.3] 24.24, [Pr.sub.2][O.sub.3] 2.01, [Nd.sub.2][O.sub.3] 4.76, [Sm.sub.2][O.sub.3] 0.38, [SiO.sub.2] 19.08, [TiO.sub.2] 9.49, [ThO.sub.2] 2.79, [UO.sub.2] 0.03, [Nb.sub.2][O.sub.5] 3.98, [H.sub.2]O 0.14, Total 99.75 wt.%. Empirical formula: [([Ce.sub.1.87][La.sub.1.24][Nd.sub.0.36][Ca.sub.0.24][Pr.sub.0.15][T h.sub.0.13][Y.sub.0.04]).sub.[SIGMA]4.06]-[([Mg.sub.0.82][Fe.sup.2+.s ub.0.19][Mn.sub.0.01]).sub.[SIGMA]1.02][([Cr.sub.1.23][Fe.sup.3+.sub. 0.68]).sub.[SIGMA]1.91][([Ti.sub.1.50][Nb.sub.0.38]).sub.[SIGMA]1.88] [Si.sub.4.01][[[O.sub.21.80][(OH).sub.0.20]].sub.[SIGMA]22.00]. Relationship to other species: It is the Mg- and [Cr.sup.3+]-dominant analogue of chevkinite-(Ce).

Name: For Vladislav Olegovich Polyakov (1950-1993), who contributed greatly to the knowledge of the mineralogy of the Urals. Comments: IMA No. 1998-029. Mossbauer and thermal analytical data are given and the crystal structure has been solved.

POPOV, V. A., PAUTOV, L. A., SOKOLOVA, E., HAWTHORNE, F. C., McCAMMON, C., and BAZHENOVA, L. F. (2001) Polyakovite-(Ce), [(REE,Ca).sub.4](Mg,[Fe.sup.2+])[([Cr.sup.3+],[Fe.sup.3+]).sub.2][(Ti ,Nb).sub.2][Si.sub.4][O.sub.22], a new metamict mineral species from the Ilmen Mountains, southern Urals, Russia: mineral description and crystal chemistry. Canadian Mineralogist 39, 1095-1104.

Raadeite

Monoclinic

[Mg.sub.7][([PO.sub.4]).sub.2][(OH).sub.8]

Locality: Near Tingelstadtjern, Modum district, southern Norway.

Occurrence: In nodules of apatite and magnesium phosphates in a serpentinite body. Associated minerals are: althausite, holtedahlite, apatite, magnesite and heneuite.

General appearance: Veinlets a few tens of [mu]m wide; rare anhedral inclusions up to 150 [mu]m; as fibrous coronae with apatite, althausite and magnesite replacing cm-size heneuite.

Physical, chemical and crystallographic properties: Luster: pearly. Diaphaneity: transparent. Color: colorless. Streak: white. Luminescence: not mentioned. Hardness: could not be determined. Tenacity: not given, probably brittle. Cleavage: could not be determined. Fracture: could not be determined. Density: could not be measured, 2.81 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, [P2.sub.1]/n, a 5.250, b 11.647, c 9.655 A, [beta] 95.94[degrees], V587.2 [A.sup.3], Z 2, a:b:c = 0.4508:1:0.8290. Morphology: no forms were observed. Twinning: none mentioned. X-ray powder diffraction data: 4.436 (75) (111), 3.521 (80) (112, 121), 3.145 (70) (122), 3.087 (70) (013), 2.905 (100) (131), 2.794 (75) (023, 041), 2.199 (80) (142, 202). Optical data: Biaxial (-), [alpha] 1.5945, [beta] 1.6069, [gamma] 1.6088, 2V(meas.) 45.6[degrees], 2V(calc.) 43[degrees]; dispersion r>v, strong; nonpleochroic; Y = b, Z probably ~ a. Chemical analytical data: Means of eight sets of electron microprobe data ([H.sub.2]O calculated to give 8 OH): MgO 55.35, CaO 0.02, MnO 0.30, FeO 0.25, [SiO.sub.2] 0.05, [P.sub.2][O.sub.5] 28.23, [As.sub.2][O.sub.5] 0.40, [SO.sub.3] 0.05, [H.sub.2]O (14.34), Total (98.99) wt.%. Empirical formula: [([Mg.sub.6.90][Mn.sub.0.02][Fe.sub.0.02]).sub.[SIGMA]6.94][[([PO.sub .4]).sub.2.00][([AsO.sub.4]).sub.0.02]].sub[SIGMA]2.02] [(OH).sub.8.00].

[Relationship to other species: It is the Mg- and [PO.sub.4]-dominant analogue of allactite, [Mn.sub.7][([AsO.sub.4]).sub.2][(OH).sub.8].

Name: For Dr. Gunnar Raade (1944-), Curator of Minerals, Natural History Museum, Oslo, Norway, in recognition of his contribution to the mineralogy of magnesium phosphates. Comments: NA No. 1996-034. The paper contains details of the crystal structure.

CHOPIN, C., FERRARIS, G., PRENCIPE, M., BRUNET, F., and MEDENBACH, 0. (2001) Raadeite, [Mg.sub.7][([PO.sub.4]).sub.2][(OH).sub.8]: a new dense-packed phosphate from Modum (Norway). European Journal of Mineralogy 13, 319-327.

Rambergite

Hexagonal

MnS

Locality: Garpenberg Norra, 19 km north of Avesta, Hedemora district, Kopparherg County, Sweden, bat. 16[degrees]11 '32" N, Long. 60[degrees] 18'33" W. Also found in the central part of the Gotland Deep in the Baltic Sea.

Occurrence: At Garpenberg Norra in a skarn. Associated minerals are: calcite, fluorite, barite, sphalerite, galena, apophyllite, pyrite, pyrrhotite, samsonite, pyrargyrite and freihergite. In the Baltic Sea occurrence, it coexists with rhodochrosite in anoxic, laminated sediments rich in organic matter.

General appearance: Hexagonal prisms (up to 1 mm long and 0.5 mm in diameter). Baltic Sea: crystals 200 x 150 [mu]m.

Physical, chemical and crystallographic properties: Luster: resinous. Diaphaneity: opaque. Color: dark brown to black. Streak: brown. Hardness: 4. Tenacity: brittle. Cleavage: {110} and {011} observed in polished sections. Fracture: uneven. Density: 3.28 g/[cm.sup.3] (calc.). Crystallography: Hexagonal, [P6.sub.3]mc, a 3.9817, c 6.4447 A, V 88.49 [A.sup.3], Z 2, c:a = 1.6186. Morphology: {100} and {001}, minor {101}. Twinning: uncommon. X-ray powder diffraction data: 3.445 (89) (100), 3.217 (72) (002), 3.036 (66) (101), 1.988 (82) (110), 1.820 (100) (103), 1.691 (63) (112). Optical data: In reflected light: steel-gray; brownred internal reflections; anisotropism, 2.62 to 2.77; bireflectance, 0.15; nonpleochroic. [R.sub.max]. & [R.sub.min.]: (24.5, 22.1 %) 470nm, (22.6, 20.5 %) 546nm, (22.1, 20.0 %) 589nm, (21.6, 19.6 %) 650nm. Chemical analytical data: Electron microprobe data gave the following empirical formula: [([Mn.sub.0.95] [Fe.sub.003]).sub.[SIGMA]0.98] [S.sub.1.00]. Relationship to o ther species: An hexagonal polymorph of alabandite.

Name: For Hans Ramberg, former professor of mineralogy and petrology, Uppsala University. Comments: IMA No. 1995-028. The complete description has not been published.

KALINOWSKI, M. P. (1996) Rambergite, a new polymorph of MnS with hexagonal structure. Geologiska Foreningens i Stockholm Forhandlinger 118, A53-A54. BOTTCHER, M. E. and HUCKRIEDE, H. (1997) First occurrence and stable isotope composition of authigenic [gamma]-MnS in the central Gotland Deep (Baltic Sea). Marine Geology 137, 201-205.

Rengeite

Monoclinic

[Sr.sub.4][ZrTi.sub.4][Si.sub.4][O.sub.22]

Locality: Two localities in the Itoigawa-Ohmi district in the easternmost part of the Renge belt, Niigata Prefecture, central Japan. The first occurrence is at Oyashirazu shore; it has been found also in the bed of the Kotaki-gawa river.

Occurrence: The mineral occurs in blue, lavender or green jade pebbles and boulders. Associated minerals in blue jade are: jadeite, titanian omphacite, sodic amphibole, titanite, rutile, anatase, strontium-apatite and tausonite. In lavender jade, associated minerals are: jadeite, titanian jadeite, rutile, titanite, zircon, natrolite, lamprophyllite, tausonite and an undetermined Sr-Ti silicate. In green jade, it is associated with jadeite, omphacite, titanite and zircon.

General appearance: Anhedral grains (up to ~ 0.5 mm) in blue jade. Fan-shaped aggregate of prismatic crystals (<0.3 mm long) in lavender jade. Elongate aggregates ( ~ 9 mm) of anhedral crystals in green jade.

Physical, chemical and crystallographic properties: Luster: adamantine. Diaphaneity: transparent. Color: dark greenish brown. Streak: pale greenish brown. Luminescence: nonfluorescent. Hardness: [VHN.sub.100] 606 to 698 kg/[mm.sup.2], Mohs 5 to 5 1/2 Tenacity: not given but probably brittle. Cleavage. none. Fracture: not given. Density: could not be measured, 4.12 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, [P2.sub.1]/a, a 13.97, b 5.675, c 11.98 A, [beta] 114.26[degrees], V 866 [A.sup.3], Z 2, a:b:c = 2.4617:1:2.1110. Morphology: no forms were observed. Twinning: none mentioned. X-ray powder diffraction data: 4.16 (m) (112), 3.13 (s) (403), 3.06 (vvs) (313), 3.00 (vs) (204), 2.86 (s) (020), 2.79 (in) (401), 2.30 (in) (405), 2.20 (vs) (315). Optical data: Biaxial (+), indices of refraction are higher than those of titanite and are too high to measure; pleochroism strong from pale green to pale greenish brown; orientation could not be determined. Chemical analytical data: Means of six sets of electron microprobe data for REE-poor material gave: GaO 0.43, FeO 0.10, SrO 34.32, BaO 0.13, [Al.sub.2][O.sub.3] 0.20, [Ce.sub.2][O.sub.3] 0.38, [Pr.sub.2][O.sub.3] 0.10, [Nd.sub.2][O.sub.3] 0.29, [Sm.sub.2][O.sub.3] 0.04, [SiO.sub.2] 22.58, [TiO.sub.2] 29.88, [ZrO.sub.2] 9.49, [Nb.sub.2][O.sub.5] 0.24, [Ta.sub.2][O.sub.5] 0.07, Total 98.25 wt.%. mpirical formula: [([Sr.sub.3.62][Ca.sub.0.08]- [Ce.sub.0.03][Nd.sub.0.002][Ba.sub.0.01][Pr.sub.0.01]).sub.[SIGMA]3.7 7][([Zr.sub.0.84][Ti.sub.0.09][Al.sub.0.04][Nb.sub.0.02][Fe.sub.0.02] ).sub.[SIGMA]1.01][Ti.sub.4.00][Si.sub.4.11][O.sub.22.00] Relationship to other species: It is the Sr- and Zr-dominant analogue of perrierite.

Name: For the locality. Comments: IMA No. 1998-055.

MIYAJIMA, H., MATSUBARA, S., MIYAWAKI, R.,YOKOYAMA, K., and HIROKAWA, K. (2001) Rengeite, [Sr.sub.4][ZrTi.sub.4][Si.sub.4][O.sub.22], a new mineral, the Sr-Zr analogue of perrierite from the ItoigawaOhmi district, Niigata Prefecture, central Japan. Mineralogical Magazine 65, 111-120.

[Cu.sub.3][([AsO.sub.4]).sub.2]*4[H.sub.2]O

Locality: The South group of the Roua copper occurrences in the upper part of the Var valley (the Daluis gorge) at the western margin of the Barrot Dome, Alpes-Maritimes, France.

Occurrence: Associated minerals are: olivenite, conichalcite, clinotyrolite, cornubite, kolfanite, pharmacosiderite, gerhardtite, atacamite, gilmarite, wallkilldellite-(Fe), cuprite, domeykite, algodonite and native copper.

General appearance: Aggregates up to 1 mm in diameter made up of crystals (up to 0.5 x 0.15 x 0.1 mm).

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: transparent. Color: bottle-green. Streak: very light green. Luminescence: nonfluorescent. Hardness: 4 to 4 1/2. Tenacity: very brittle. Cleavage: {001} good. Fracture: conchoidal. Density: 3.9 g/[cm.sup.3] (meas.), 3.85 g/[cm.sup.3] (calc.). Crystallography: Orthorhombic, Pnma, a 5.6906, b 17.061, c 9.732 A, V 944.9 [A.sup.3], Z 4, a:b:c = 0.3335:1:0.5704. Morphology: {0l0}, {011}, {101}, {001}; habit elongate on [100] and slightly flattened on [100]. Twinning: none observed. X-ray powder diffraction data: 8.520 (100) (020), 3.721 (60) (131), 3.221 (90) (141, 051), 3.102 (40) (132), 2.817 (35) (103, 033), 2.795 (35) (142), 2.366 (20) (240, 071), 2.350 (25) (143, 053), 2.133 (25) (080, 251). Optical data: Biaxial (-), [alpha] 1.745, [beta] 1.755, [gamma] 1.760, 2V(meas.) 71[degrees] 2V(calc.) 70[degrees]; dispersion r<v, strong; nonpleochroic; orientation, X = a, Y = c, Z = b. Chemical analytical data: Means of ten sets of electron microprobe data: CuO 44.87, [As.sub.2][O.sub.5] 42.44, [H.sub.2]O (12.69), Total (100.00) wt.%. [H.sub.2]O calculated by difference. Empirical formula: [Cu.sub.3.09][([AsO.sub.4]).sub.2.02]-[(OH).sub.0.12]*3.80[H.sub.2]O. Relationship to other species: None apparent.

Name: For Pierre Rolland (1940-), an eminent collector of the Roua mines. Comments: IMA No. 1998-001. The abstractor drew the crystal drawing produced here with the assistance of Dr. Halil Sarp and Prof. Andre Lalonde.

SARP, H. and CERNY, R. (2000) Rollandite, [Cu.sub.3][([AsO.sub.4]).sub.2]*4[H.sub.2]O, a new mineral: its description and crystal structure. European Journal of Mineralogy 12, 1045-1050.

Ronneburgite

Monoclinic

[K.sub.2]Mn[V.sub.4][O.sub.12]

Locality: The mine dump of the Lichtenberg open-pit at the southwest margin of Ronneburg, Thuringia, Germany.

Occurrence: In a uranium deposit in slates and limestones. Associated minerals are: humnierite, gypsum, epsomite, picromerite, hematite and an unidentified K-Mg-Mn-vanadate. Sincosite, simplotite and straczekite were found a few meters away. More than 230 species are known from the Ronneburg deposit.

General appearance: Crystals of equant, flattened or short prismatic habit (up to 0.5 mm).

Physical, chemical and crystallographic properties: Luster: adamantine. Diaphaneity: translucent. Color: reddish-brown. Streak: brownish orange. Luminescence: nonfluorescent. Hardness. 3. Tenacity: brittle. Cleavage: indistinct in one direction. Fracture: irregular. Density: 2.84 g/[cm.sup.3] (meas.), 2.83 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, [P2.sub.1]/n, a 8.183, b 9.247, c 8.651 A, [beta] 109.74[degrees], V 611.4 [A.sup.3], Z 2, a:b:c = 0.8849:1:0.9355. Morphology: no forms were mentioned. Twinning: none mentioned. X-ray powder diffraction data: 5.509 (32) (111), 3.701 (55) (211), 3.336 (100) (121), 3.118 (50) (122), 3.000 (36) (112), 2.878 (64) (103), 2.752 (68) (222). Optical data: Biaxial (-), [alpha] 1.925, [beta] 1.960, [gamma] 1.988, 2V(meas.) 82[degrees], 2V(calc.) 82[degrees]; dispersion not given; pleochroism X = brownish orange with a distinct reddish tint, Y = brownish orange, Z = brownish orange; orientation could not be determined. Chemical analytical data: Means of twenty sets of electron microprobe data: [K.sub.2]O 16.93, MgO 0.62, MnO 12.44, [V.sub.2][O.sub.5] 68.54, Total 98.53 wt.%. Empirical formula: [K.sub.1.91][([Mn.sub.0.93][Mg.sub.0.08]).sub.[SIGMA]1.01][V.sub.4.01 ][O.sub.12.00]. Relationship to other species: It is chemically related to fianelite, [Mn.sub.2]V(V,As)[O.sub.7]*2[H.sub.2]O.

Name: For the locality. Comments: IMA No. 1998-069.

WITZKE, T., ZHEN, S., SEFF, K., DOERING, T., NASDALA, L., and KOLITSCH, U. (2001) Ronneburgite, [K.sub.2][MnV.sub.4][O.sub.12], a new mineral from Ronneburg, Thuringia, Germany: Description and crystal structure. American Mineralogist 86, 1081-1086.

Schiavinatoite

Tetragonal

(Nb,Ta)[BO.sub.4]

Locality: Antsongombato, south of Betafo, some tens of kilometers south of the village of Mahaiz, Madagascar.

Occurrence: In a pegmatite. Associated minerals (in addition to the normal rock-forming minerals of granitic pegmatites) are: behierite, rhodizite, spodumene, elbaite-liddicoatite series of the tourmaline group, danburite, cesian beryl, pollucite, manganoan fluorapatite, uranoan microlite, xenotime, monazite, manganocolumbite, manganotantalite, hubnerite and hafnian zircon. Schiavinatoite occurs intimately associated with behierite, (Ta,Nb)[BO.sub.4].

General appearance: Part of a well-formed, flattened bipyramidal crystal about 4 mm across. Five similar crystals up, one up to 2 cm long, have been found but not exhaustively characterized.

Physical, chemical and crystallographic properties: Luster: vitreous, but the optical properties indicate adamantine. Diaphaneity: transparent in thin section. Color: grayish pink. Streak: white. Luminescence: nonfluorescent. Hardness: about 8. Tenacity: not given, probably brittle. Cleavage: none observed. Fracture: not given. Density: not measured, 6.57 g/[cm.sup.3] (calc.). Crystallography: Tetragonal, [I4.sub.1]/amd, a 6.219, c 5.487 A, V 212.2 [A.sup.3], Z 4, c:a = 0.8823. Morphology: first and second order tetragonal bipyramid and a tetragonal prism. Twinning: none observed. X-ray powder diffraction data: 4.115 (100) (101), 3.110 (84) (200), 2.481 (36) (211), 2.328 (49) (112), 1.939 (29) (301), 1.646 (25) (321), 1.598 (42) (312). Optical data: Uniaxial (+), approximate mean index of refraction 2.30. Chemical analytical data: In the crystal studied, 38 of the 54 points analyzed by microprobe represent behierite. Means of sixteen sets of electron microprobe data ([B.sub.2][O.sub.3] calculated to give 1 B): [B.sub.2][O.sub.3] (16.60), [Nb.sub.2][O.sub.5] 33.08, [Ta.sub.2][O.sub.5] 50.37, Total (100.05) wt.%. Empirical formula: [([Nb.sub.0.52][Ta.sub.0.48]).sub.[SIGMA]1.00][BO.sub.4]. Relationship to other species: It is the Nb-dominant analogue of behierite, (Ta,Nb)[BO.sub.4].

Name: For Professor Giuseppe Schiavinato (1915-1996) distinguished Italian mineralogist who helped the development of mineralogical sciences in Italy. The name is pronounced "skee-ah-vee-nat-toh-ite". Comments: IMA No. 1999-051.

DEMARTIN, F., DIELLA, V., GRAMMACCIOLI, C., and PEZZOTTA, F. (2001) Schiavinatoite. (Nb,Ta)[BO.sub.4], the Nb analogue of behierite. European Journal of Mineralogy 13, 159-165.

Sicherite

Orthorhombic

[TlAg.sub.2][(As,Sb).sub.3][S.sub.6]

Locality: Lengenbach quarry, Binntal, Canton Valais, Switzerland.

Occurrence: In dolomitic rock. Associated minerals are: realgar, hutchinsonite, hatchite and jentschite.

General appearance: Aggregates (up to 2 mm across) of individual crystals (up to 0.4 mm).

Physical, chemical and crystallographic properties: Luster: metallic. Diaphaneity: opaque. Color: dark gray to black. Streak: dark brown red. Hardness: [VHN.sub.10] 58.3 kg/[mm.sup.2], Mohs [less than or equal to]3. Tenacity: not given but probably brittle. Cleavage: not observed. Fracture: uneven to conchoidal. Density: not measured, 5.26 g/[cm.sup.3] (calc.). Crystallography: Orthorhombic, Pmnb, a 12.479, b 15.522, c 5.719 A, V 1107.8 [A.sup.3], Z 4, a:b:c = 0.8040:1:0.3684. Morphology: {141} dominant with {001}, {010}, {031}, {301} minor. Twinning: none mentioned. X-ray powder diffraction data: 3.655 (16) (131), 3.363 (50) (301), 3.290 (23) (240, 311), 3.210 (26) (041), 3.118 (27) (141), 2.822 (100) (340, 331, 012), 2.540 (17) (341), 2.070 (15) (600, 071). Optical data: In reflected light: pure white, very few dark red internal reflections, extremely weak anisotropism. [R.sub.1], [R.sub.2]; [[blank].sup.im][R.sub.1], [[blank].sup.im][R.sub.2]: (31.43, 33.43; 15.98, 18.41%) 470nm, (28.31, 30.52; 13.48, 15. 80 %) 546nm, (27.10, 29.11; 12.54, 4.56 %) 589nm, (25.57, 27.44; 11.36, 13.17 %) 650nm. Chemical analytical data: Means of 103 sets of electron microprobe data: Cu 0.22, Ag 23.98, Tl 23.63, Sb 10.96, As 19.08, S 21.65, Total 99.52 wt.%. Empirical formula: [Tl.sub.1.02][([Ag.sub.1.96][Cu.sub.0.03]).sub.[SIGMA]1.99][([As.sub. 2.24][Sb.sub.0.79]).sub.[SIGMA]3.03]- [S.sub.5.95].

Relationship to other species: Although the chemical composition and unit cell suggest a possible relationship with the hutchinsonite group of merotypes, no simple structural relationship exists.

Name: For Valentin Sicher (1925-) an active member of the Lengenbach syndicates since 1963 who contributed greatly to specimen recovery efforts. Comments: IMA No. 1997-051.

GRAESER, S., BERLEPSCH, P., MAKOVICKY, E., and BALIC-ZUNIC, T. (2001) Sicherite, [TlAg.sub.2][(As,Sb).sub.3][S.sub.6], a new sulfosalt mineral from Lengenbach (Binatal, Switzerland): Description and structure determination. American Mineralogist 86, 1087-1093.

Telluronevskite

Trigonal

[Bi.sub.3][TeSe.sub.2]

Locality: Vihorlat Mountnins, 8 km SSE of Snina near Kosice in eastern Slovakia, Slovak Republic.

Occurrence: As disseminated grains in quartzite. Associated minerals are: quartz, pyrite, pyrrhotite, sphalerite, chalcopyrite and stannite.

General appearance: Massive aggregates (up to 2 mm in diameter) and disseminated tabular crystals.

Physical, chemical and crystallographic properties: Luster: metallic. Diaphaneity: opaque. Color: steel gray. Streak: black. Hardness: [VHN.sub.10] 100 kg/[mm.sup.2]. Tenacity: flexible. Cleavage: {001} perfect. Fracture: not given. Density: 8.1 g/[cm.sup.3] (meas.), 8.08 g/[cm.sup.3] (calc.). Crystallography: Trigonal, P3m1, a 4.264, c 23.25 A, V 366 [A.sup.3], Z 2, c:a = 5.4526. Morphology: Only {001} was observed. Twinning: none mentioned. X-ray powder diffraction data: 4.66 (19) (005), 3.32 (13) (103, 007), 3.12 (100) (104), 2.28 (33) (108), 2.13 (36) (110, 109), 1.935 (16) (115, 00.12), 1.355 (18) (214, 1.0.16). Optical data: In reflected light: white with a yellow tint, moderate anisotropism, weak bireflectance, pleochroism not noted. [R.sub.max.], [R.sub.min.]: (48.5, 46.6 %) 470nm, (51.1, 48.5 %) 546nm, (51.9, 49.5 %) 589nm, (52.8, 50.5 %) 650nm. Chemical analytical data: Means of four sets of electron microprobe data: Bi 68.84, Pb 0.42, Se 15.41, Te 14.58, S 1.14, Total 100.39 wt.%. Empirical formula: [([Bi.sub.2.92][Pb.sub.0.02]).sub.[SIGMA]2.94] [Te.sub.1.01][([Se.sub.1.75][S.sub.0.32]).sub.[SIGMA]2.07]* Relationship to other species: It is related to the members of the tetradymite group.

Name: For the chemical similarity to nevskite, Bi(Se,S), with the addition of Te. Comments: IMA No. 1993-027a.

RIDKOSIL, T., SKALA, R., JOHAN, Z., and SREIN, V. (2001) Telluronevskite, [Bi.sub.3][TeSe.sub.2], a new mineral. European Journal of Mineralogy 13, 177-185.

Theoparacelsite

Orthorhombic

[Cu.sub.3]([OH.sub.2])[As.sub.2][O.sub.7]

Locality: The old copper mines of Roua (North and South group) in the upper part of the Var valley (the Daluis gorge) at the western margin of the Barrot dome, Alpes-Maritimes area, about 50 km from Nice, France.

Occurrence: Associated minerals are: dolomite, calcite, aragonite, copper, cuprite, domeykite, algodonite, koutekite, gold, silver, olivenite, cornubite, clinotyrolite, connelite, brochantite, malachite, trippkeite, pharmacosiderite, strashimirite and gilmarite.

General appearance: Aggregates in cuprite cavities 1 mm in diameter. The aggregates consist of crystals (up to 0.2 x 0.1 x 0.05 mm, rectangular elongated crystals (up to 90 x 10 x 5 [mu]m), perfect rectangular crystals (10 x 7 x 2 [mu]m), equidimensional crystal (~ 20[mu]m), pseudomorphs after thin acicular crystals of olivenite and also as powder.

Physical, chemical and crystallographic properties: Luster: vitreous to adamantine. Diaphaneity: translucent. Color: dark pistachio green. Streak: yellowish green. Luminescence: nonfluorescent. Hardness: could not be measured. Tenacity: brittle. Cleavage: (001) perfect. Fracture: conchoidal. Density. could not be measured, 4.73 g/[cm.sup.3] (calc.). Crystallography: Orthorhombic, Pmma, a 8.32 12, b 2.9377, c 4.6644 A, V 114.02 [A.sup.3] Z 2/3, a:b:c = 2.8326:1:1.5878. Morphology: {001}, {010}, {100}, {110} and {l01}. Twinning: none. X-ray powder diffraction data: 4.065 (15) (101), 3.104 (100) (201), 2.486 (70) (011), 2.400 (25) (210), 2.330 (15) (002), 1.672 (30) (212), 1.596 (25) (411), 1.330 (25) (601, 221). Optical data: Biaxial (+), [alpha] 1.81, [beta] 1.82, [gamma] 1.86, 2V(meas.) 57[degrees], 2V(calc.) 54[degrees]; dispersion r>v, moderate; pleochroism X = light olive green, Y = olive green, Z = dark pistachio green; orientation, X = a, Y = c, Z = b. Chemical analytical data: Means of five sets of electron microprobe data (with [H.sub.2]O by difference): CuO 48.77, [As.sub.2][O.sub.5] 47.68, [H.sub.2]O (3.55), Total (100.00) wt.%. Empirical formula: [Cu.sub.2.99][(OH).sub.1.92][As.sub.2.02] [O.sub.7.08]. Relationship to other species: None apparent.

Name: For Philippus Aureolus Bombastus von Hohenheim (1493- 1541), called Paracelse which is a Greco-Roman translation of Hohenheim meaning "close to the sky." Paracelse was an important physician, chemist, alchemist and doctor who also worked in mineralogy (De Mineralibus, De Elemento Aquae & Fructibus eius). He is known in toxicology for having said "All is poison, nothing is poison, it is the dosage which makes the poison." Comments: IMA No. 1998-012.

SARP, H. and CERNY R. (2001) Theoparacelsite, [Cu.sub.3]([OH.sub.2])[As.sub.2][O.sub.7], a new mineral: its description and crystal structure. Archives de Science Geneve 54(1) 7-14.

Woodallite

Trigonal

[Mg.sub.6][Cr.sub.2]([OH.sub.16])[Cl.sub.2]*4[H.sub.2]O

Locality: The Mount Keith deposit, 94 km NNE of Leinster in the northeastern Goldfields district, Western Australia, Australia.

Occurrence: In lizardite+brucite-altered dunite in a large, lowgrade disseminated nickel sulphide deposit. Associated minerals are: chromite. lizardite, iowaite, pentlandite, magnetite, tochilinite and brucite.

General appearance: Whorls and clusters (up to 6 mm across) of minute platelets (5 to 100 [micro]m).

Physical, chemical and crystallographic properties: Luster: resinous to waxy. Diaphaneity: transparent. Color: deep magenta to purple. Streak: pale pink to white. Luminescence: nonfluorescent. Hardness: 1 1/2 to 2. Tenacity: flexible but not elastic. Cleavage: {001} perfect. Fracture: not given. Density: 2.062 g/[cm.sup.3] (meas.), 2.04 g/[cm.sup.3] (calc.). Crystallography: Trigonal, R3m, a 3.103, c 24.111 A, V 201.14 [A.sup.3], Z 3/8, c:a = 7.7702. Morphology: no forms were mentioned, tabular on {0011}. Twinning: none mentioned.

X-ray powder diffraction data: 8.0361 (100) (003), 4.0205 (48) (006), 2.6239 (3) (012), 2.3488 (5) (015), 2.0072 (6) (0.1.12), 1.6977 (2) (0.1.11), 1.5237 (2) (113, 1.0.13) Note: the last spacing is indexed erroneously as (213, 1.0.13). Optical data: Uniaxial (-), [omega] 1.555, [epsilon] 1.535, pleochroism distinct from violet to pinkish lilac. Chemical analytical data: Means of an unspecified number of sets of electron microprobe data (corrected for loss of volatiles): Mg 22.90, Cr 9.56, Fe 4.30, Al 0.60, [H.sub.2]O 10.96, OH 41.40, Cl 8.71, S 0.03, [CO.sub.3] 1.52, Total 99.98 wt.%. [CO.sub.3] content is based on total C measured by Leco carbon analyser. Empirical formula: [Mg.sub.6.23][([Cr.sub.1.21][Fe.sub.0.51][Al.sub.0.15]).sub.[SIGMA]1. 87]-[(OH).sub.16.08][[[Cl.sub.1.62][([CO.sub.3]).sub.0.17] [([SO.sub.4]).sub.0.01]].sub.[SIGMA]1.80]*4.02[H.sub.2]O. Relationship to other species: It is a member of the hydrotalcite group, specifically the Cr-dominant analogue of iowaite, [Mg.sub.6][Fe.sub.2][(OH).sub.16]- [Cl.sub.2]4[H.sub.2]O.

Name: For Roy Woodall (1930-), eminent Australian geologist. Comments: IMA No. 2000-042.

GRGURIC, B. A., MADSEN, I. C., and PRING, A. (2001) Woodallite, a new chromium analogue of iowaite from the Mount Keith nickel deposit, Western Australia. Mineralogical Magazine 65, 427-435.

Zaccagnaite

Hexagonal

[Zn.sub.4][Al.sub.2][(OH).sub.12]([CO.sub.3])*3[H.sub.2]O

Locality: Calagio quarry, Colonnata valley, Carrara basin, Apuan Alps, northern Tuscany, Italy.

Occurrence: In cavities in calcite veins in the famous Carrara marble. Associated minerals are: hydrozincite and fraipontite. It formed as an alteration product of sphalerite by reaction with aluminum-rich hydrothermal fluids.

General appearance: Minute hexagonal crystals less than 0.2 mm long and 0.02 to 0.03 mm thick. These are covered by a thin crust of fraipontite and resemble so-called "Brugola" screws (i.e., set-screws).

Physical, chemical and crystallographic properties: Luster: subvitreous. Diaphaneity: transparent to translucent. Color: white. Streak: white. Luminescence: not given. Hardness: not given. Tenacity: not given. Cleavage: (0011 perfect. Fracture: not given. Density.' could not be measured, 2.84 g/[cm.sup.3] (calc.). Crystallography: Hexagonal, [P6.sub.3]/mmc, a 3.0725, c 15.114 A, V 123.62 [A.sup.3] Z 1/3 c:a = 4.9191. Morphology: no forms were mentioned but {001} and {100} probably are present. Twinning: none mentioned. X-ray powder duff raction data: 7.51 (vs) (002), 3.794 (in) (004), 2.65 (w) (100), 2.511 (mw) (102), 2.175 (mw) (104), 1.890 (w) (008), 1.830 (mw) (106), 1.542 (ins) (108), 1.539 (ins) (110). Optical data: could not be determined because of the small size, the fragility and the coatings on the crystals. Chemical analytical data: Means of four sets of electron microprobe data: CuO 0.24, ZnO 56.01, [Al.sub.2][O.sub.3] 18.44, [SiO.sub.2] 0.09, Total 74.78 wt.%. Here, 28.63 wt.% [H.sub.2]O and 7.85 wt.% [CO.sub.2] were added to give 9([H.sub.2]O and 1[([CO.sub.3]); this raises the analytical total to 111.12 wt.%, Recalculation to give 100.00 wt.% (and ignoring [SiO.sub.2]) gives: CuO 0.22, ZnO 50.40, [Al.sub.2][O.sub.3] 16.59, [CO.sub.2] (7.02), [H.sub.2]O (25.76), Total (100.00) wt.%. Empirical formula: [([Zn.sub.3.90][Cu.sub.0.02]).sub.[SIGMA]3.92][A1.sub.2.05][(OH).sub. 11.99][([CO.sub.3]).sub.1.00]*3.00[H.sub.2]O. Relationship to other species: It is a member of the hydrotalcite group.

Name: For the late scholar Domenico Zaccagna (1851-1940) who was born in Carrara and died in Rome. He published the first geological map of the Apuan Alps and was a competent collector of minerals from the Carrara marble. His collection is preserved in Museo di Storia Naturale e del Territorio at the University of Pisa. Comments: IMA No. 1997-019. Because of the very small size of the crystals, many of the usual physical properties could not be determined. Prof. Merlino kindly supplied additional data. The crystal structure was determined.

MERLINO, S. and ORLANDI, P.(2001) Carraraite and zaccagnaite, two new minerals from the Carrara marble quarries: their chemical compositions, physical properties, and structural features. American Mineralogist 86, 1293-1301.

Zincowoodwardite

Trigonal

[[Zn.sub.1-x][Al.sub.x][(OH).sub.2]][[([SO.sub.4]).sub.x/2][([H.sub.2 ]O).sub.n]]

Locality: Laurion, Greece and also the Hilarion mine and the Christiana mine both at Kamariza near Laurion, Greece.

Occurrence: Associated minerals are: glaucocerinite, natroglaucocerinite, zaccagnaite, serpierite and hemimorphite.

General appearance: Botryoidal crusts of tabular crystals (5 to 10 [mu]m).

Physical, chemical and crystallographic properties: Luster: waxy. Diaphaneity: translucent. Color: pale bluish to bluish-white. Streak: white to bluish-white, Luminescence: not mentioned. Hardness: 1. Tenacity: sectile. Cleavage: not discernible. Fracture: not mentioned. Density: 2.66 g/[cm.sup.3] (meas.), 2.71 g/[cm.sup.3] (calc.). Crystallography: Trigonal (Rhombohedral), probably R3m for the -3R polytype, a 3.065, c 25.42 A, V 206.8 [A.sup.3], Z 3, c:a = 8.2936 (See Comments). Morphology: no forms were mentioned. Twinning: none mentioned. The -1T polytype gave the following data: Trigonal, probably P3, a 3.063, c 8.91 A, V 72.4 [A.sup.3], Z 1, c:a = 2.9089. Analysis by AAS and CHN gave the empirical formula: [[Zn.sub.0.55][Cu.sub.0.12][Al.sub.0.33][(OH).sub.2.00]][[([H.sub.3]O ).sub.0.11][Na.sub.0.04][([SO.sub.4]).sub.0.17][([CO.sub.3]).sub.0.07 ])[([H.sub.2]O).sub.0.96]]. X-ray powder diffraction data: The -3R polytype: 8.50 (100) (003), 4.248 (33) (006), 2.600 (5) (012), 2.354 (4) (015), 2.039 (3) (018), 1.5 32 (2) (110), 1.508 (2) (113). The -1T polytype: 8.9 (100) (001), 4.47 (90) (002), 2.65 (30) (100), 2.55 (60) (101), 2.28 (50) (102), 1.98 (30) (103), 1.53 (30) (110), 1.51 (30) (111). Optical data: Uniaxial (sign unknown), [omega] 1.5636, [epsilon] could not be measured, nonpleochroic. The -1T polytype has [omega] 1.558. Chemical analytical data: ICP-MS analysis gave: CaO 10.4, ZnO 33.3, [A1.sub.2][O.sub.3] 17.2, [SO.sub.3] 12.6, [H.sub.2]O 25.1, Total 98.6 wt.%. Empirical formula: [[Zn.sub.0.47][Cu.sub.0.15][A1.sub.0.38][(OH).sub.2.00]] [[([SO.sub.4]).sub.0.18][O.sub.0.01][([H.sub.2]O).sub.0.59]]. Relationship to other species: It is a member of the hydrotalcite group and closely related to woodwardite, honessite, glaucocerinite, hydrowoodwardite and zaccagnaite. The descriptions of natroglaucocerinite and zaccagnaite are in press.

Name: For the relationship to woodwardite. Comments: IMA No. 1998-026.

WITZKE, T. and RAADE, G. (2000) Zincowoodwardite, [[Zn.sub.1-x]-[Al.sub.x][(OH).sub.2][[([SO.sub.4]).sub.x/2][([H.sub.2 ]O).sub.a]], a new mineral of the hydrotalcite group. Neues Jahrbuch fir Mineralogie, Monatshefte 2000, 455-465.

Zugshunstite-(Ce)

Monoclinic

(Ce,Nd,La)Al[([SO.sub.4]).sub.2]([C.sub.2][O.sub.4])*12[H.sub.2]O

Locality: Alum Cave Bluff, Great Smoky Mountains National Park, Tennessee, USA.

Occurrence: In an evaporite assemblage. Associated minerals are: coskreaite-(Ce), levinsonite-(Y), melanterite, halotrichite, picketingite, apjohnite, epsomite and other hydrated sulfates.

General appearance: Equant, stubby individual crystals (up to 1.0 mm in diameter) and subparallel aggregates (up to 1.5 mm in diameter).

Physical, chemical and crystallographic properties: Luster: not given but probably vitreous. Diaphaneity: transparent. Color: pale pink under incandescent light, pale blue under fluorescent light. Streak: white. Luminescence: none observed. Hardness: not determined. Tenacity: brittle. Cleavage: {010} poor. Fracture: irregular. Density: not determined, 2.12 g/[cm.sup.3] (calc.). Crystallography: Monocinic, C2/c, a 8.718, b 18.313, c 13.128 A, [beta] 93.90[degrees], V 2091.0 [A.sup.3], Z 4, a:b:c = 0.4761:1:0.7169. Morphology: {010}, {012} dominant; (111} minor. Twinning: none mentioned. X-ray powder diffraction data: 7.9 (100) (110), 5.36 (50) (022), 5.01 (40) (130), 3.93 (70) (023, 220, 113, 132), 3.74 (20) (042, 202, 113), 3.29 (20) (115, 222, 004), 3.07 (20) (114, 024, 060). Optical data: Biaxial (sign not given but +), [alpha] 1.455, [beta] 1.485, [gamma] 1.528, 2V(meas.) 85[degrees], 2V(calc.) 82[degrees], dispersion r>v, medium; nonpleochroic; orientation not observed. Chemical analytical data: Means of an unstated number of sets of electron microprobe data: [Y.sub.2][O.sub.3] n.d, [La.sub.2][O.sub.3] 2.16, [Ce.sub.2][O.sub.3] 13.17, [Pr.sub.2][O.sub.3] 1.68, [Nd.sub.2][O.sub.3] 6.50, [Sm.sub.2][O.sub.3] 0.80, [Eu.sub.2][O.sub.3] 0.27, [Gd.sub.2][O.sub.3] 0.14, [Dy.sub.2][O.sub.3] n.d., [Er.sub.2][O.sub.3] n.d., CaO 0.04, [Al.sub.2][O.sub.3] 6.92, [Fe.sub.2][O.sub.3] 1.11, [SO.sub.3] 24.01, [C.sub.2][O.sub.3] (10.80), [H.sub.2]O (32.41), Total (100.01) wt.%. [C.sub.2][O.sub.3] and [H.sub.2]O were calculated to give 1.00([C.sub.2][O.sub.4]) and 12([H.sub.2]O), respectively. Empirical formula: [([Ce.sub.0.54][Nd.sub.0.56][La.sub.0.09][Pr.sub.0.07]-[Sm.sub.0.03][ Eu.sub.0.01][Gd.sub.0.01]).sub.[SIGMA]1.01][([Al.sub.0.91][Fe.sup.3+. sub.0.09]).sub.[SIGMA]1.00][([SO.sub.4]).sub.2.00][([C.sub.2][O.sub.4 ]).sub.1.00]*12.00[H.sub.2]O. Relationship to other species: None stated.

Name: For the locality; it is the authors' best approximation of an anglicized equivalent to words used by the Cherokee Indians to refer to the Great Smoky Mountains (Tsu-g-shv-sdi). Comments: IMA No. 1996-055.

ROUSE, R. C., PEACOR, D. R., ESSENE, E. J., COSKREN, T. D., and LAUF, R. J. (2001) The new minerals levinsonite-(Y) [(Y,Nd,Ce)Al[([SO.sub.4]).sub.2]([C.sub.2][O.sub.4])* 12[H.sub.2]O] and zugshunstite-(Ce) [(Ce,Nd,La)Al[([SO.sub.4]).sub.2]([C.sub.2][O.sub.4])*12[H.sub.2]O]: Coexisting oxalates with different structures and differentiation of LREE and HREE. Geochimica et Cosmochimica Acta 65, 1101-1115.
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Author:Mandarion, J.A.
Publication:The Mineralogical Record
Geographic Code:1USA
Date:Mar 1, 2002
Words:14767
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