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Abstracts of new mineral descriptions.

Megakalsilite

Hexagonal

KAlSi[O.sub.4]

Locality: The Khibina alkaline massif, Kola Peninsula, Russia

Occurrence: In a large body of hyperagpaitic pegmatite in ijoliteurtite, near their contact with apatite-nepheline rocks. Associated minerals are: cancrinite, sodalite and natrite (all of which are intergrown with megakalsilite). K-feldspar, natrolite, pectolite, aegirine, nacaphite, vitusite, fluorcaphite, belovite, umbite, lemmleinite-K, lomonosovite, lovozerite, phlogopite, sphalerite and galena.

General appearance: A corroded, anhedral grain 2 to 3 mm across.

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: transparent. Color: colorless. Streak: white. Luminescence: fluoresces pale whitish green in ultraviolet light (240 to 400 nm). Hardness: 6. Tenacity: brittle. Cleavage: none. Fracture: conchoidal. Density: 2.58 g/[cm.sup.3] (meas.), 2.62 g/[cm.sup.3] (calc.). Crystallography: Hexagonal, P[6.sub.3], a 18.104, c 8.467 [Angstrom], V 2403.3 [[Angstrom].sup.3], Z 24, c:a = 0.4677. Morphology: no forms were observed. Twinning: none mentioned. X-ray powder diffraction data: 3.18 (50) (141), 3.091 (100) (222), 2.612 (70) (060), 1.674 (50) (173), 1.585 (50) (282, 225), 1.516 (50) (145, 660), 1.240 (60) (4.10.1, 066, 583), 1.204 (50) (4.10.2, 285), 1.031 (50) (666, 228). Optical data: Uniaxial (-), [omega] 1.538, [epsilon] 1.531, nonpleochroic. Chemical analytical data: Means of thirty sets of electron microprobe data: [Na.sub.2]O 0.02, [K.sub.2]O 29.73, FeO 0.04, [Al.sub.2][O.sub.3] 32.38, Si[O.sub.2] 37.96, Ti[O.sub.2] 0.01, Total 100.14 wt.%. Empirical formula: [K.sub.1.00][Al.sub.1.00][Si.sub.1.00][O.sub.4.00]. Relationship to other species: It is a polymorph of KAlSi[O.sub.4].

Name: For the relationship with kalsilite the most common form of KAlSi[O.sub.4] in nature; the prefix mega (from the Greek [mu][epsilon][gamma][alpha][zeta]) alludes to the much higher unit cell volume of this mineral (2403 [[Angstrom].sup.3]) compared to that of kalsilite (200 [[Angstrom].sup.3]). Comments: IMA No. 2001-008.

KHOMYAKOV, A. P., NECHELYUSTOV, G. N., SOKOLOVA, E., BONACCORSI, E., MERLINO, S., and PASERO, M. (2002) Megakalsilite, a new polymorph of KAlSi[O.sub.4] from the Khibina massif, Kola Peninsula, Russia: Mineral description and crystal structure. Canadian Mineralogist 40, 961-970.

Moeloite

Orthorhombic

[Pb.sub.6][Sb.sub.6][S.sub.14]([S.sub.3])

Locality: The Ceragiola marble quarry, near the small town of Seravezza, in Versilia, at the southern rim of the Apuan Alps, province of Lucca, northern Tuscany, about 35 km north of Pisa, Italy. The Seravezza area is 20 km southwest of Carrara.

Occurrence: In small cavities within marble. Associated minerals are: sulfur, pyrite and enargite. In these cavities many other sulfosalts have been found: guettardite, robinsonite, zinkenite, boulangerite, semseyite, jordanite, tetrahedrite, sulvanite, colusite, famatinite and kesterite.

General appearance: Very thin, needle-like crystals (up to 0.1 X 0.1 X 5 mm) or as soft plumose aggregates of flexible thin fibers up to 5 mm long.

Physical, chemical and crystallographic properties: Luster: metallic. Diaphaneity: opaque. Color: grayish-black to brownish-red. Streak: brown. Hardness: could not be determined. Tenacity: flexible. Cleavage: not observed. Fracture: not given. Density: could not be measured, 5.87 g/[cm.sup.3] (calc.). Crystallography: Orthorhombic, P[2.sub.1][22.sub.1], a 15.328, b 4.0400, c 23.054 [Angstrom], V 1427.6 [[Angstrom].sup.3], Z 2, a:b:c = 3.7941:1:5.7064. Morphology: no forms were identified, elongated on [010]. Twinning: none observed. X-ray powder diffraction data: 3.724 (55) (106), 3.427 (100) (403), 3.047 (85) (312), 2.844 (58) (503), 2.779 (70) (016), 2.753 (45) (116), 2.017 (80) (614), 1.733 (50) (0.1.12). Optical data: In reflected light: white, moderate anisotropism, nonpleochroic; rare red internal reflections in oil. [R.sub.1], [R.sub.2]; [.sup.im][R.sub.1], [.sup.im][R.sub.2]: (40.0, 37.8; 26.6, 24.2%) 470nm, (38.8, 36.5; 24.9, 22.8%) 546nm, (38.6, 36.7; 23.4, 21.4%) 589nm, (36.5, 34.7; 21.2, 20.1%) 650nm. Chemical analytical data: Means of four sets of electron microprobe data: Pb 48.94, Sb 29.47, S 21.76, Total 101.17 wt.%. Empirical formula: [Pb.sub.6.02][Sb.sub.6.04][S.sub.16.94]. Relationship to other species: None apparent, but it is the natural analogue of synthetic material.

Name: For Dr. Yves Moelo (1949-), Institut des Materiaux de Nantes, France in recognition of his contributions to lead sulfosalt mineralogy. He also characterized the synthetic equivalent of this phase. Comments: IMA No. 1998-045.

ORLANDI, P., MEERSCHAUT, A., PALVADEAU, P., and MERLINO, S. (2002) Lead-antimony sulfosalts from Tuscany (Italy). V. Definition and crystal structure of moeloite, [Pb.sub.6][Sb.sub.6][S.sub.14]([S.sub.3]), a new mineral from the Ceragiola marble quarry. European Journal of Mineralogy 14, 599-606.

Monazite-(Sm)

Monoclinic

(Sm,Gd,Ce)P[O.sub.4]

Locality: Annie Claim #3 granitic pegmatite, 1.2 km northwest of Greer Lake, southeastern Manitoba, Canada (Lat. 50[degrees]21'12" N. Long. 95[degrees]20'18" W).

Occurrence: In a pegmatite. Associated minerals are: manganocolumbite, quartz, albite and lithian muscovite.

General appearance: Platy subhedral crystals up to 0.4 mm.

Physical, chemical and crystallographic properties: Luster: given as vitreous to slightly greasy, but the optical data indicate adamantine. Diaphaneity: translucent to transparent. Color: yellowish. Streak: white. Luminescence: nonfluorescent. Hardness: could not be measured. Tenacity: brittle. Cleavage: one good direction. Fracture: uneven. Density: could not be measured, 5.51 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, P[2.sub.1]ln, a 6.725, b 6.936, c 6.448 [Angstrom], [beta] 104.02[degrees], V 291.8 [[Angstrom].sup.3], Z 4, a:b:c = 0.9696:1:0.9296. Morphology: no forms were observed. Twinning: none mentioned. X-ray powder diffraction data: 5.191 (40) ([bar.1]01), 4.647 (50) (011), 4.164 (80) ([bar.1]11), 3.492 (40B) (111, 020), 3.264 (70) (200), 3.065 (100) (120), 2.857 (90) ([bar.1]12, 012). Optical data: Biaxial (+), [alpha] 1.768, [beta] 1.771, [gamma] 1.818 (calc.), 2V(meas.) 29[degrees], dispersion not mentioned; pleochroism not mentioned; X = b, Y ^ a = 5_ in obtuse angle [beta], Z ^ c = 9[degrees] in obtuse angle [beta]. Chemical analytical data: Means of three sets of electron microprobe data: CaO 2.75, PbO 2.14, [Y.sub.2][O.sub.3] 1.29, [La.sub.2][O.sub.3] 2.10, [Ce.sub.2][O.sub.3] 10.04, [Pr.sub.2][O.sub.3] 1.58, [Nd.sub.2][O.sub.3] 6.03, [Sm.sub.2][O.sub.3] 13.02, [Gd.sub.2][O.sub.3] 12.06, [Tb.sub.2][O.sub.3] 1.14, [Dy.sub.2][O.sub.3] 1.18, [Yb.sub.2][O.sub.3] 0.02, [Lu.sub.2][O.sub.3] 0.05, Zr[O.sub.2] 0.71, Th[O.sub.2] 16.27, U[O.sub.2] 0.62, Si[O.sub.2] 1.53, [P.sub.2][O.sub.5] 27.48, Total 100.01 wt.%. Empirical formula: ([Sm.sub.0.18][Gd.sub.0.16][Th.sub.0.15][Ce.sub.0.15][Ca.sub.0.12][Nd.sub.0.09][La.sub.0.03][Y.sub.0.03][Pb.sub.0.02][Pr.sub.0.02][Tb.sub.0.02][Dy.sub.0.02][Zr.sub.0.01][U.sub.0.01])[.sub.[SIGMA]0.97][(P[O.sub.4])[.sub.0.94](Si[O.sub.4])[.sub.0.06]][.sub.[SIGMA]1.00]. Relationship to other species: It is the Sm-dominant member of the monazite series.

Name: For the relationship to the monazite series. Comments: IMA No. 2001-001.

MASAU, M., CERNY, P., COOPER, M. A., CHAPMAN, R., and GRICE, J. D. (2002) Monazite-(Sm), a new member of the monazite group from the Annie Claim #3 granitic pegmatite, southeastern Manitoba. Canadian Mineralogist 2002, 1649-1655.

Mottanaite-(Ce)

Monoclinic

[Ca.sub.4](CeCa)Al[Be.sub.2]([Si.sub.4][B.sub.4][O.sub.22])[O.sub.2]

Locality: Monte Cavalluccio, Sacrofano, north of Rome, Italy.

Occurrence: In miarolitic cavities in a feldspathoid-bearing alkali-syenitic ejectum from the "lower pyroclastic flow" of the Sabatini volcanic complex. The only associated mineral noted is britholite-(Ce) with which it is intergrown.

General appearance: Small (< 0.5 mm) tabular crystals.

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: translucent to transparent. Color: brown to pale brown. Streak: white. Luminescence: nonfluorescent. Hardness: not given. Tenacity: brittle. Cleavage: absent. Fracture: conchoidal. Density: 3.61 g/[cm.sup.3] (meas.), 3.88 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, P2/a, a 19.032, b 4.746, c 10.248 [Angstrom], [beta] 110.97[degrees], V 864.3 [[Angstrom].sup.3], Z 2, a:b:c = 4.0101:1:2.1593. Morphology: {010}, tabular. Twinning: none observed. X-ray powder diffraction data: 3.452 (67) ([bar.2]12), 3.243 (80) (410), 3.085 (85) ([bar.4]12), 2.916 (86) (212), 2.854 (100) (411), 2.647 (84) (013), 2.646 (86) ([bar.4]13), 2.635 (84) ([bar.6]11). Optical data: Biaxial (-), [alpha] 1.680, [beta] 1.694, [gamma] 1.708, 2V(meas.) 90[degrees], 2V(calc.) 89[degrees]; dispersion not given; nonpleochroic; orientation not given. Chemical analytical data: Means of two to four sets of electron microprobe data (light elements by SIMS): [Li.sub.2]O 0.037, [Na.sub.2]O 0.00, BeO 2.94, MgO 0.140, CaO 24.46, BaO 0.002, [B.sub.2][O.sub.3] 13.85, [Al.sub.2][O.sub.3] 2.53, [Cr.sub.2][O.sub.3] 0.00, [Mn.sub.2][O.sub.3] 0.00, [Fe.sub.2][O.sub.3] 3.06, [Y.sub.2][O.sub.3] 0.073, [La.sub.2][O.sub.3] 7.42, [Ce.sub.2][O.sub.3] 12.63, [Pr.sub.2][O.sub.3] 1.103, [Nd.sub.2][O.sub.3] 2.36, [Sm.sub.2][O.sub.3] 0.137, [Eu.sub.2][O.sub.3] 0.020, [Gd.sub.2][O.sub.3] 0.094, [Dy.sub.2][O.sub.3] 0.024, [Er.sub.2][O.sub.3] 0.005, [Yb.sub.2][O.sub.3] 0.002, Si[O.sub.2] 23.85, Ti[O.sub.2] 0.560, Th[O.sub.2] 4.01, U[O.sub.2] 0.430, [H.sub.2]O 0.390, F 1.00, sum 101.13, less O = F 0.42, Total 100.71 wt.%. Empirical formula: [Ca.sub.4.00][(REE)[.sub.1.47][Ca.sub.0.37][Th.sub.0.15][U.sub.0.02]][.sub.[SIGMA]2.01]([Al.sub.0.50][Fe.sup.3+.sub.0.38][Ti.sub.0.07][Mg.sub.0.03])[.sub.[SIGMA]0.98]([Be.sub.1.18][Li.sub.0.02])[.sub.[SIGMA]1.20][B.sub.3.99][Si.sub.3.98][O.sub.22.00][[O.sub.1.04][F.sub.0.53](OH)[.sub.0.43]][.sub.[SIGMA]2.00]. Relationship to other species: It is a member of the hellandite group.

Name: For Annibale Mottana (1940-), Professor of Mineralogy at the Universita di Roma Tre, Italy. Comments: IMA No. 2000-020.

DELLA VENTURA, G., BONAZZI, P., OBERTI, R., and OTTOLONI, L. (2002) Ciprianiite and mottanaite-(Ce), two new minerals of the hellandite group from Latium (Italy). American Mineralogist 87, 739-744. OBERTI, R., DELLA VENTURA, G., OTTOLONI, L., HAWTHORNE, F. C., and BONAZZI, P. (2002) Re-definition, nomenclature and crystal-chemistry of the hellandite group. American Mineralogist 87, 745-752.

Niigataite

Monoclinic

CaSr[Al.sub.3]([Si.sub.2][O.sub.7])(Si[O.sub.4])O(OH)

Locality: Miyabana seashore, Ohmi Town, Itoigawa-Ohmi district, Niigata Prefecture, Japan.

Occurrence: In a prehnite boulder. Associated minerals are: prehnite, diaspore and chlorite. Minor constituents are: zircon, galena, cinnabar and strontian clinozoisite.

General appearance: Subhedral grains 0.5 mm across.

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: transparent. Color: pale gray with a yellowish green tint. Streak: white. Luminescence: nonfluorescent. Hardness: VH[N.sub.100] 642 to 907 kg/[mm.sup.2], 5 to 5 1/2. Tenacity: brittle. Cleavage: perfect in one direction. Fracture: not given. Density: could not be measured, 3.64 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, P[2.sub.1]/m, a 8.890, b 5.5878, c 10.211 [Angstrom], [beta] 115.12[degrees], V 459.3 [[Angstrom].sup.3], Z 2, a:b:c = 1.5910:1:1.8274. Morphology: no forms were observed. Twinning: none mentioned. X-ray powder diffraction data: 5.05 (23) (10[bar.2]), 3.22 (25) (201), 2.90 (100) (11[bar.3]), 2.79 (48) (020), 2.70 (26) (013), 2.60 (24) (31[bar.1]), 2.40 (21) (31[bar.3]), 2.11 (24) (221), .872 (21) (22[bar.4]), 1.397 (22) (040). Optical data: Complete data could not be determined due to scarcity of material, indices of refraction are between 1.67 and 1.725, violet anomalous interference color was observed. Chemical analytical data: Means of nine sets of electron microprobe data (with [H.sub.2]O calculated to give 1 OH): MgO 0.07, CaO 14.09, MnO 0.22, SrO 14.75, [Al.sub.2][O.sub.3] 24.86, [Fe.sub.2][O.sub.3] 7.08, Si[O.sub.2] 35.49, Ti[O.sub.2] 0.75, [H.sub.2]O (1.77), Total (99.08) wt.%. Empirical formula: [Ca.sub.1.00]([Sr.sub.0.72][Ca.sub.0.28])[.sub.[SIGMA]1.00]([Al.sub.2.48][Fe.sub.0.45][Ti.sub.0.05][Mn.sub.0.02][Mg.sub.0.01])[.sub.[SIGMA]3.01][Si.sub.3.00][O.sub.12.00](OH)[.sub.1.00]. Relationship to other species: It is a member of the epidote group; specifically, the strontium-dominant analogue of clinozoisite.

Name: For the locality. Comments: IMA No. 2001-055.

MIYAJIMA, H., MATSUBARA, S., MIYAWAKI, R., and HIROKAWA, K. (2003) Niigataite, CaSr[Al.sub.3]([Si.sub.2][O.sub.7])(Si[O.sub.4])O(OH): Sr-analogue of clinozoisite, a new member of the epidote group from Itoigawa-Ohmi district, Niigata Prefecture, central Japan. Journal of Mineralogical and Petrological Sciences 98, 118-129.

Nikischerite

Trigonal

Na[Fe.sub.6.sup.2+][Al.sub.3](S[O.sub.4])[.sub.2](OH)[.sub.18] * 12[H.sub.2]O

Locality: Huanuni tin mine, about 50 km SE of Oruro City, Dalence Province, Oruro Department, Bolivia.

Occurrence: Nikischerite does not occur in the cassiterite-bearing veins themselves, but rather in a later, low-temperature paragenesis filling fault zones which cut across the cassiterite veins. Associated minerals are: pyrite, pyrrhotite, siderite and cronstedtite in a brownish clay matrix.

General appearance: Small micaceous plates (up to 4 mm) forming isolated radiating balls comprised of stacked plates and aggregates up to almost 1 cm across. A second occurrence, found in the early 1990's consists of dull, tabular aggregates on vivianite crystals.

Physical, chemical and crystallographic properties: Luster: dull to greasy. Diaphaneity: transparent to translucent. Color: Georgian green (RHS # 139B), darker at the edges of aggregates and approaches grayish white at the cores. Streak: pale grayish green. Luminescence: nonfluorescent. Hardness: 2. Tenacity: brittle. Cleavage: {001} perfect. Fracture: irregular. Density: 2.33 g/[cm.sup.3] (meas.), 2.34 g/[cm.sup.3] (calc.). Crystallography: Trigonal, R[bar.3], a 9.352, c 33.08 [Angstrom], V 2505 [[Angstrom].sup.3], Z 3, c:a = 3.5372. Morphology: {001}. Twinning: none observed. X-ray powder diffraction data: 10.980 (100) (003), 5.539 (60) (006), 4.311 (20) (113), 3.674 (50) (009), 2.624 (25) (033), 2.425 (30) (036), 2.176 (20) (039), 1.932 (30) (0.3.12). Optical data: Uniaxial (-), [omega] 1.560, [epsilon] could not be determined, nonpleochroic. Chemical analytical data: Means of an unspecified number of sets of electron microprobe data (with [H.sub.2]O calculated to give 42 H): [Na.sub.2]O 2.43, FeO 43.59, [Al.sub.2][O.sub.3] 14.35, S[O.sub.3] 13.54, [H.sub.2]O (35.06), Total (108.97) wt.%. Empirical formula: [Na.sub.0.85][Fe.sup.2+.sub.6.55][Al.sub.3.04](S[O.sub.4])[.sub.1.83](OH)[.sub.19.41] * 11.30[H.sub.2]O. Relationship to other species: It is the [Fe.sup.2+]-dominant analogue of shigaite, Na[Mn.sub.6.sup.2+][Al.sub.3](S[O.sub.4])[.sub.2](OH)[.sub.18] * 12[H.sub.2]O, and motukoreaite, Na[Mg.sub.6][Al.sub.3](S[O.sub.4])[.sub.2](OH)[.sub.18] * 12[H.sub.2]O.

Name: For Anthony (Tony) J. Nikischer (1949-), amateur mineralogist and mineral dealer of Peekskill, New York.

Comments: IMA No. 2001-039. Tony Nikischer kindly provided some of the data not given in the paper.

HUMINICKI, D. M. C. and HAWTHORNE, F. C. (2003) The crystal structure of nikischerite, Na[Fe.sub.6.sup.2+][Al.sub.3](S[O.sub.4])[.sub.2](OH)[.sub.18]([H.sub.2]O)[.sub.12], a mineral of the shigaite group. Canadian Mineralogist 41, 79-82. HUMINICKI, D. M. C., HAWTHORNE, F. C., GRICE, J. D., ROBERTS, A. R., and JAMBOR, J. L. (2003) Nikischerite, a new mineral from the Huanuni tin mine, Dalence Province, Oruro Department, Bolivia. Mineralogical Record 34, 155-158.

Novgorodovaite

Monoclinic

[Ca.sub.2]([C.sub.2][O.sub.4])[Cl.sub.2] * 2[H.sub.2]O

Locality: The Chelkar salt dome, west Kazakhstan.

Occurrence: In evaporite rock. Associated minerals are: anhydrite, gypsum, halite, bischofite, magnesite and hilgardite.

General appearance: aggregates (up to 3 cm) of grains (up to 7 mm).

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: transparent. Color: colorless. Streak: white. Luminescence: nonfluorescent. Hardness: 2 1/2. Tenacity: brittle. Cleavage: {100} and {010} medium. Fracture: uneven. Density: 2.38 g/[cm.sup.3] (meas.), 2.40 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, I2/m, a 6.936, b 7.382, c 7.443 [Angstrom], [beta] 94.3[degrees], V 380.0 [[Angstrom].sup.3], Z 2, a:b:c = 0.9396:1:1.0083. Morphology: equant. Twinning: none observed. X-ray powder diffraction data: 5.062 (7) (110), 4.812 (5) (101), 4.323 (7) (11[bar.1]), 4.063 (7) (111), 3.644 (5) (020), 2.956 (8) (21[bar.1]), 2.917 (10) (112). Optical data: Biaxial (-), [alpha] 1.565, [beta] 1.645, [gamma] 1.725, 2V(meas.) 88[degrees], 2V(calc.) 86[degrees]; dispersion not observed; Y = b, Z ^ c = 40[degrees] (synthetic). Chemical analytical data: Analysis (Ca and Cl by electron microprobe, C and H by selective sorption of combustion products in oxygen, O by difference) gave: Ca 29.43, Cl 24.56, H 1.67,C 8.53,O (35.81), Total (100.00) wt.%. Empirical formula: [Ca.sub.1.83]([C.sub.2][O.sub.4])[.sub.1.77][Cl.sub.1.72] * 2.06[H.sub.2]O. Relationship to other species: It is an oxalate.

Name: For Margarita Ivanovna Novgorodova (1938-) well known Russian mineralogist and director of the Fersman Mineralogical Museum of the Russian Academy of Sciences. Comments: IMA No. 2000-039. The crystal structure has been solved.

CHUKANOV, N. V., BELAKOVSKIY, D. I., RASTSVETAEVA, R. K., KARIMOVA, O. V., and ZADOV, A. E. (2001) Novgorodovaite [Ca.sub.2]([C.sub.2][O.sub.4])[Cl.sub.2] * 2[H.sub.2]O, a new mineral. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva 130(4), 32-35.

Paceite

Tetragonal

CaCu(C[H.sub.3]COO)[.sub.4] * 6[H.sub.2]O

Locality: The Potosi silver-lead-zinc deposit, 2 km northeast of Broken Hill, New South Wales, Australia (Lat. 31[degrees]56' S, Long. 141[degrees]30' E).

Occurrence: In gossan. Associated minerals are: goethite, hematite, quartz, linarite, malachite, azurite, cuprian smithsonite, cerussite and hoganite.

General appearance: Short, prismatic crystals (up to 1 mm across).

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: translucent. Color: deep sky blue. Streak: pale blue. Luminescence: nonfluorescent. Hardness: 1 1/2. Tenacity: brittle. Cleavage: {100} and {110} perfect. Fracture: uneven. Density: 1.49 g/[cm.sup.3] (calc.). Crystallography: Tetragonal, I4/m, a 11.155, c 16.226 [Angstrom], V 2020.13 [[Angstrom].sup.3], Z 4, c:a = 1.4555. Morphology: {100}, {001} and {111}. Twinning: none observed. X-ray powder diffraction data: 9.297 (6) (101), 8.132 (8) (002), 7.896 (100) (110), 5.586 (15) (200), 3.530 (20) (310), 3.042 (3) (321), 2.497 (4) (420). Optical data: Uniaxial (+), [omega] 1.439, [epsilon] 1.482, pleochroism O = bluish with a grayish tint, E = pale bluish with a grayish tint, O [greater than or equal to] E. See Comments. Chemical analytical data: Wet chemical analysis by AAS (Ca), CHN analyzer (C and H) and O by difference gave: C 21.25, H 5.3, Cu 14.1, Ca 9.0, O (50.35), Total (100.00) wt.%. Empirical formula: [Ca.sub.1.02][Cu.sub.1.00](C[H.sub.3]COO)[.sub.4.00] * 5.87[H.sub.2]O. Relationship to other species: It is an acetate.

Name: For Frank L. Pace (1948-) of Broken Hill, New South Wales, Australia, an ex-miner and well-known collector of Broken Hill minerals who drew the mineral to the attention of the describers. Comments: IMA No. 2001-030. Due to the very small amount of natural material, the optical properties were determined from synthetic crystals grown from aqueous solutions. Determination of the crystal structure was not attempted.

HIBBS, D. E., KOLITSCH, U., LEVERETT, P., SHARPE, J. L., and WILLIAMS, P. A. (2002) Hoganite and paceite, two new acetate minerals from the Potosi mine, Broken Hill, Australia. Mineralogical Magazine 66, 459-464.

Paratsepinite-Ba

Monoclinic

(Ba,Na,K)[.sub.2-x](Ti,Nb)[.sub.2]([Si.sub.4][O.sub.12])(OH,O)[.sub.2] * 4[H.sub.2]O

Locality: Lepkhe-Nelm Mt., Lovozero massif, Kola Peninsula, Russia.

Occurrence: A hydrothermal mineral in an alkaline pegmatite. Associated minerals are: microcline, aegirine, nepheline, magnesio-arfvedsonite, eudialyte, lorenzenite, lamprophyllite, catapleiite, titanite, vinogradovite, tundrite-(Ce), apatite, neptunite, tsepinite-Na, kuzmenkoite-Zn, korobitsynite.

General appearance: Long, prismatic crystals (up to 5 mm) in cavities and as aggregates.

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: transparent. Color: brown. Streak: white. Luminescence: nonfluorescent. Hardness: 5. Tenacity: brittle. Cleavage: not observed. Fracture: uneven. Density: 2.88 g/[cm.sup.3] (meas.), 2.95 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, C2/m, a 14.551, b 14.001, c 15.702 [Angstrom], [beta] 117.58[degrees], V 2835 [[Angstrom].sup.3], Z 8, a:b:c = 1.0393:1:1.1215. Morphology: no forms were observed. Twinning: none observed. X-ray powder diffraction data: 7.11 (10) (020), 4.08 (8) (310), 3.95 (10) (202, 20[bar.4]), 3.24 (9) (400, 40[bar.4]), 3.11 (8) (042, 024), 2.403 (8) (60[bar.2]), 1.914 (9) (20[bar.8]), 1.634 (8) (75[bar.5]). Optical data: Biaxial (+), [alpha] 1.667, [beta] 1.674, [gamma] 1.770, 2V(meas.) 30[degrees], 2V(calc.) 32[degrees]; dispersion not observed; pleochroism not observed; X < c, Y = b, Z ^ a = 28[degrees] in obtuse angle [beta]. Chemical analytical data: Means of five sets of electron microprobe data ([H.sub.2]O by TGA): [Na.sub.2]O 1.80, [K.sub.2]O 1.69, CaO 0.51, MnO 1.25, SrO 1.96, BaO 11.02, [Al.sub.2][O.sub.3] 0.22, Si[O.sub.2] 38.86, Ti[O.sub.2] 17.73, [Nb.sub.2][O.sub.5] 11.60, [H.sub.2]O 12.85, Total 99.50 wt.%. Empirical formula: ([Ba.sub.0.46][Na.sub.0.37][K.sub.0.23][Sr.sub.0.12][Mn.sub.0.11][Ca.sub.0.06])[.sub.[SIGMA]1.35]([Ti.sub.1.41][Nb.sub.0.55])[.sub.[SIGMA]1.96]([Si.sub.4.10][Al.sub.0.03])[.sub.[SIGMA]4.13][O.sub.12.39][(OH)[.sub.1.80][O.sub.0.20]][.sub.[SIGMA]2.00] * 3.62[H.sub.2]O. Relationship to other species: It is a member of the labuntsovite group with Ba-dominant and the c-parameter twice that of tsepinite-Na.

Name: For the relationship to tsepinite-Na. Comments: IMA No. 2002-006.

CHUKANOV, N. V., PEKOV, I. V., ZADOV, A. E., ROZENBERG, K. A., RASTSVETAEVA, R. K., KRIVOVICHEV, S. V., and LEVITSKAYA, L. A. (2003) New minerals tsepinite-K (K,Ba,Na)[.sub.2](Ti,Nb)[.sub.2]([Si.sub.4][O.sub.12])[(OH,O).sub.2] * 3[H.sub.2]O and paratsepinite-Ba (Ba,Na,K)[.sub.2-x](Ti,Nb)[.sub.2]([Si.sub.4][O.sub.12])(OH,O)[.sub.2] * 4[H.sub.2]O and their relationship with other labuntsovite group minerals. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva 132, 38-51.

Paravinogradovite

Triclinic

[Na.sub.2][Ti.sub.3][Fe.sup.3+]([Si.sub.2][O.sub.6][.sub.2]([Si.sub.3]Al[O.sub.10])(OH)[.sub.4] * [H.sub.2]O

Locality: Mount Kukisvumchorr, Khibina alkaline massif, Kola Peninsula, Russia.

Occurrence: In miarolitic cavities in a nepheline-feldspar pegmatite. Associated minerals are: albite, carbonate-fluorapatite, ancylite-(Ce), natrolite, aegirine, a glauconite-like mineral, nordstrandite, anatase, fluorite, galena, cerussite and vinogradovite.

General appearance: Fan-shaped aggregates of columnar and acicular crystals up to 1.0 cm long.

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: transparent to translucent. Color: colorless to white. Streak: white. Luminescence: fluoresces weak yellow-green under 240-400 nm radiation. Hardness: 5. Tenacity: brittle. Cleavage: {001} perfect and {010} indistinct. Fracture: splintery. Density: 2.77 g/[cm.sup.3] (meas.). 2.74 g/[cm.sup.3] (calc.). Crystallography: Triclinic, P1, a 5.246, b 8.734, c 12.968 [Angstrom], [alpha] 70.32[degrees], [beta] 79.01[degrees], [gamma] 89.90[degrees], V 547.65 [[Angstrom].sup.3], Z 1, a:b:c = 0.6006:1:1.4848. Morphology: no forms were mentioned. Twinning: none mentioned. X-ray powder diffraction data: 11.9 (58) (001), 5.98 (35) (002), 5.88 (65) (0[bar.1]1, 012), 4.35 (38) (121, 102), 3.182 (100) (0[bar.1]3, 014), 3.085 (29) (123), 2.735 (21) (1[bar.2]2, 030). Optical data: Biaxial (-), [alpha] 1.707, [beta] 1.741, [gamma] 1.755, 2V(meas.) 64[degrees], 2V(calc.) 64[degrees]; dispersion r > v; nonpleochroic; X ^ a = 30[degrees], Z [approximately equal to] b. Chemical analytical data: Means of eighteen sets of electron microprobe data (BeO calculated by stoichiometry, [H.sub.2]O by Penfield method): [Na.sub.2]O 7.77, [K.sub.2]O 0.87, MgO 0.13, BeO 0.76, [Al.sub.2][O.sub.3] 6.12, [Fe.sub.2][O.sub.3] 4.11, Si[O.sub.2] 43.54, Ti[O.sub.2] 29.59, [Nb.sub.2][O.sub.5] 0.50, [H.sub.2]O 6.23, Total 99.62 wt.%. Empirical formula: ([Na.sub.2.28][K.sub.0.17])[.sub.[SIGMA]2.45]([Ti.sub.3.37][Fe.sub.0.47][Nb.sub.0.03][Mg.sub.0.03])[.sub.[SIGMA]3.90]([Si.sub.6.59][Al.sub.1.09][Be.sub.0.28])[.sub.[SIGMA]7.96][O.sub.22.00](OH)[.sub.3.74] * 1.27[H.sub.2]O. Relationship to other species: It is chemically and structurally related to vinogradovite.

Name: For the relationship to vinogradovite. Comments: IMA No. 2002-033.

KHOMYAKOV, A. P., KULIKOVA, I. E., SOKOLOVA, E., HAWTHORNE, F. C., and KARTASHOV, P. M. (2003) Paravinogradovite, (Na, [square])[.sub.2][([Ti.sup.4+],[Fe.sup.3+])[.sub.4]{[Si.sub.2][O.sub.6]}[.sub.2]{[Si.sub.3]Al[O.sub.10]}(OH)[.sub.4]][H.sub.2]O, a new mineral species from the Khibina alkaline massif, Kola Peninsula, Russia: description and crystal structure. Canadian Mineralogist 41, 989-1002.

Percleveite-(Ce)

Tetragonal

(Ce,La,Nd)[.sub.2][Si.sub.2][O.sub.7]

Locality: The Bastnas Fe-Cu-REE deposit, Skinnskatteberg, Vastmanland, Sweden (Lat. 59[degrees]51' N, Long. 15[degrees]35' E).

Occurrence: Known from a single old specimen in the Swedish Museum of Natural History. Associated minerals are: cerite-(Ce), bastnasite-(Ce), magnetite, chalcopyrite and a clino-amphibole close to the borderline between actinolite and tremolite. Rarer associates are: allanite-(Ce), tornebohmite-(Ce), scheelite and quartz.

General appearance: Anhedral grains (up to 0.5 mm) across in aggregates several mm wide.

Physical, chemical and crystallographic properties: Luster: greasy to resinous. Diaphaneity: transparent in thin section. Color: yellowish gray to white. Streak: white. Luminescence: non-fluorescent. Hardness: about 6. Tenacity: not given but probably brittle. Cleavage: 001} imperfect. Fracture: not given. Density: could not be measured, 5.20 g/[cm.sup.3] (calc.). Crystallography: Tetragonal, P[4.sub.1], a 6.7805, c 24.689 [Angstrom], V 1135.1 [[Angstrom].sup.3], Z 8, c:a = 3.6412. Morphology: no forms were observed. Twinning: none mentioned. X-ray powder diffraction data: 3.271 (31) (202), 3.135 (27) (203), 3.121 (24) (116), 3.084 (100) (008), 3.011 (18) (211), 2.846 (22) (213), 2.034 (19) (219). Optical data: Uniaxial (+), [omega] 1.840, [epsilon] 1.846, nonpleochroic. Chemical analytical data: Means of four sets of electron microprobe data: MgO 0.00, CaO 0.10, [Al.sub.2][O.sub.3] 0.00, [Fe.sub.2][O.sub.3] 0.01, [Y.sub.2][O.sub.3] 2.93, [La.sub.2][O.sub.3] 14.66, [Ce.sub.2][O.sub.3] 31.36, [Pr.sub.2][O.sub.3] 3.41, [Nd.sub.2][O.sub.3] 12.97, [Sm.sub.2][O.sub.3] 2.69, [Gd.sub.2][O.sub.3] 2.26, [Dy.sub.2][O.sub.3] 0.53, [Ho.sub.2][O.sub.3] 0.07, [Er.sub.2][O.sub.3] 0.21, [Yb.sub.2][O.sub.3] 0.04, Si[O.sub.2] 26.55, Total 97.79 wt.%. Empirical formula: ([Ce.sub.0.87][La.sub.0.41][Nd.sub.0.35][Y.sub.0.12][Pr.sub.0.09][Sm.sub.0.07][Gd.sub.0.06][Dy.sub.0.01][Ca.sub.0.01])[.sub.[SIGMA]1.99][Si.sub.2.01][O.sub.7.00]. Relationship to other species: None apparent.

Name: For Per Theodor Cleve (1840-1905) a professor of chemistry at Uppsala University and the discoverer of the elements holmium and thulium. "Cleveite" a REE-bearing variety of uraninite was named for him by Nordenskiold in 1878. Comments: IMA No. 2002-023.

HOLTSTAM, D., NORRESTAM, R., and ANDERSSON, U. B. (2003) Percleveite-(Ce)--a new lanthanide disilicate mineral from Bastnas, Skinnskatteberg, Sweden. European Journal of Mineralogy 15, 725-731.

Potassic chloropargasite

Monoclinic

(K,Na)[Ca.sub.2]([Fe.sup.2+],Mg)[.sub.4]Al([Si.sub.6][Al.sub.2][O.sub.22])(Cl,OH)[.sub.2]

Locality: Elgoras Mt., Sal'nye Tundry, Kola Peninsula, Russia.

Occurrence: In the granulite complex of the massif. Associated minerals are: chlorapatite, almandine, diopside, enstatite, chlorian biotite, potassic pargasite, marialite and plagioclase.

General appearance: Grains up to 0.5 mm.

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: opaque. Color: black. Streak: olive green. Luminescence: nonfluorescent. Hardness: 5 1/2. Tenacity: brittle. Cleavage: {110} perfect. Fracture: uneven. Density: 3.29 g/[cm.sup.3] (meas.), 3.36 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, C2/m, a 9.843, b 18.130, c 5.362 [Angstrom], [beta] 105.5[degrees], V 922.1 [[Angstrom].sup.3], Z 2, a:b:c = 0.5429:1:0.2958. Morphology: no forms were mentioned, habit equant. Twinning: none observed. X-ray powder diffraction data: 8.42 (8) (110), 3.116 (3) (310), 2.951 (3) ([bar.1]51, 221), 2.714 (10) (151), 2.562 (7) (241), 1.444 (3) ([bar.5]33). See COMMENTS. Optical data: Biaxial (-), [alpha] 1.675, [beta] 1.687, [gamma] 1.690, 2V(meas.) 65[degrees], 2V(calc.) 53[degrees]; dispersion r > < v, strong, moderate, weak; pleochroism X = light gray, Y = gray, Z = dark green, X < Y < Z; Y = b. Chemical analytical data: Means of unstated sets of electron microprobe data: [Na.sub.2]O 1.22, [K.sub.2]O 3.03, MgO 9.08, CaO 11.41, FeO 16.63, [Al.sub.2][O.sub.3] 15.05, Si[O.sub.2] 38.71, Ti[O.sub.2] 0.26, [H.sub.2]O 0.84, Cl 4.33, sum 100.56, less O = Cl 0.98, Total 99.58 wt.%. Empirical formula: [K.sub.0.60][Na.sub.0.37][Ca.sub.1.91]([Fe.sub.2.17][Mg.sub.2.11][Al.sub.0.82][Ti.sub.0.03])[.sub.[SIGMA]5.13]([Si.sub.6.05][Al.sub.1.95][O.sub.21.98])[[Cl.sub.1.15](OH)[.sub.0.87]][.sub.[SIGMA]2.02]. See COMMENTS. Relationship to other species: It is a member of the amphibole group, calcic subgroup.

Name: For the composition within the amphibole classification. Comments: IMA No. 2001-036. The paper gives the formula with Mg > Fe, but the calculations show that the atomic proportion of Fe is slightly higher than that of Mg; the formula given here shows Fe > Mg. The strongest lines of the X-ray powder diffraction data given in the paper's abstract are quite different from those given in Table 2 of the paper. The former match those given in the IMA proposal and are presented here.

CHUKANOV, N. V., KONILOV, A. N., ZADOV, A. E., BELAKOVSKIY, D. I., and PEKOV, I. V. (2002) The new amphibole potassic chloropargasite (K,Na)[Ca.sub.2](Mg,[Fe.sup.2+])[.sub.4]Al([Si.sub.6][Al.sub.2][O.sub.22])(Cl,OH)[.sub.2] and conditions of its formation in the granulite complex of Sal'nye Tundry massif (Kola Peninsula). Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva 131(2), 58-62.

Potassicleakeite

Monoclinic

K[Na.sub.2][Mg.sub.2][Fe.sub.2.sup.3+]Li[Si.sub.8][O.sub.22](OH)[.sub.2]

Locality: Tanohata mine, Iwate Prefecture, Japan.

Occurrence: In pegmatite-like veinlets in a manganese ore deposit. Associated minerals are: quartz, K-feldspar, vanadium-dominant mangan-neptunite, suzukiite, roscoelite and serandite.

General appearance: Prismatic crystals (up to 2 mm long and 0.2 mm wide).

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: transparent. Color: reddish brown. Streak: pale brownish yellow. Luminescence: not mentioned. Hardness: VH[N.sub.100] 425 to 572 kg/[mm.sup.2], Mohs about 5. Tenacity: brittle. Cleavage: {110} perfect. Fracture: uneven. Density: not measured, 3.18 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, C2/m, a 9.922, b 17.987, c 5.286 [Angstrom], [beta] 104.07[degrees], V 915.1 [[Angstrom].sup.3], Z 2, a:b:c = 0.5516:1:0.2939. Morphology: no forms were mentioned; elongated on [001]. Twinning: none mentioned. X-ray powder diffraction data: 8.48 (67) (110), 4.50 (89) (040), 3.40 (46) (131), 3.28 (45) (240), 3.16 (72) (310, 201), 2.83 (49) (330), 2.74 (44) ([bar.3]31), 2.71 (41) (151), 2.53 (100) ([bar.2]02). Optical data: Biaxial (+), [alpha] 1.672, [beta] 1.680, [gamma] 1.692, 2V not measured, 2V(calc.) 79[degrees]; dispersion not given; pleochroism distinct, X = yellowish brown, Y = pale brown, Z = reddish brown; X ^ c = 35 to 40[degrees] in obtuse angle [beta], Y ^ a = 21 to 26[degrees] in acute angle [beta], Z = b. Chemical analytical data: Means of six sets of electron microprobe data and three sets of LAM-ICP-MS data ([H.sub.2]O calculated to give 2 OH): [Li.sub.2]O 1.20, [Na.sub.2]O 8.73, [K.sub.2]O 3.10, MgO 7.23, CaO 0.13, MnO 7.81, [Al.sub.2][O.sub.3] 0.44, [V.sub.2][O.sub.3] 5.52, [Fe.sub.2][O.sub.3] 9.45, Si[O.sub.2] 55.34, Ti[O.sub.2] 0.29, [H.sub.2]O (2.08), Total (101.32) wt.%. Empirical formula: ([K.sub.0.57][Na.sub.0.46])[.sub.[SIGMA]1.03]([Na.sub.1.98][Ca.sub.0.02])[.sub.[SIGMA]2.00]([Mg.sub.1.29][Mn.sub.0.65])[.sub.[SIGMA]1.94]([Fe.sup.3+.sub.1.02][V.sub.0.64][Mg.sub.0.26][Al.sub.0.05][Ti.sub.0.03])[.sub.[SIGMA]2.00]([Li.sub.0.70][Mn.sub.0.30])[.sub.[SIGMA]1.00]([Si.sub.7.98][Al.sub.0.02])[.sub.[SIGMA]8.00][O.sub.22.00](OH)[.sub.2.00]. Relationship to other species: It is a member of the amphibole group, specifically the sodic subgroup, and it is the K-dominant analogue of leakeite, Na[Na.sub.2][Mg.sub.2][Fe.sub.2.sup.3+]Li[Si.sub.8][O.sub.22](OH)[.sub.2].

Name: For the relationship with leakeite. Comments: IMA No. 2001-049.

MATSUBARA, S., MIYAWAKI, R., KUROSAWA, M., and SUZUKI, Y. (2002) Potassicleakeite, a new amphibole from the Tanohata mine, Iwate Prefecture, Japan. Journal of Mineralogical and Petrological Sciences 97, 177-184.

J. A. Mandarino

Chairman Emeritus of the Commission on New Minerals and Mineral Names of the International Mineralogical Association

and

Curator Emeritus

Department of Mineralogy

Royal Ontario Museum

100 Queen's Park

Toronto, Ontario, Canada M5S 2C6
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Author:Mandarino, J.A.
Publication:The Mineralogical Record
Date:Mar 1, 2005
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