Printer Friendly

Abstracts of new mineral descriptions.

Kanonerovite

Monoclinic

[MnNa.sub.3][P.sub.3][O.sub.10].12[H.sub.2]O

Locality: Kazennitsa pegmatite vein, Alabashka pegmatite field, Middle Urals, Russia ((Lat. 57[degrees]47' N, Long. 61[degrees]03' E).

Occurrence: In cavities of a granite pegmatite of muscovite-albitemicrocline type which cuts biotite granite-gneisses and porphyry granites. Associated minerals are: muscovite, quartz, elbaite, topaz, milarite, calcite, chabazite, stilbite-stellerite, rutile, fluorite, pyrrhotite, sphalerite and pyrite.

General appearance: As a crust (0.1 to 1.2 mm) on quartz, topaz and cassiterite crystals. Individual crystals have dimensions of a few tenths of millimeters.

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: transparent. Color: colorless. Streak: white. Luminescence: nonfluorescent. Hardness: 2 1/2 to 3. Tenacity: brittle. Cleavage: {010} poor. Fracture: uneven. Density: 1.91 g/cm (3) (meas.), 1.88 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, [P2.sub.1]/n, a 14.71, b 9.33, c 15.13 , [Angstrom], [beta] 89.80, V 2075 [[Angstrom].sup.3], Z4, a:b:c = 1.5766:1:1.6217. Morphology: {l00}, (0011, {010}, {023}, (423} and (210}; habit platy on (100} and elongated on [001]. Twinning: none mentioned. X-ray powder diffraction data: 10.50 (75) (101, 101), 7.36 (100) (200), 6.95 (90) (111, 111), 3.316 (60) (411, 411, 123, 321, 321, 313), 3.162 (50) (214, 214), 2.889 (60) (420, 124, 032), 2.391 (48) (225, 206, 206). Optical data: Biaxial (-), [alpha] 1.453, [beta] 1.459, [gamma] could not he determined, 2V could not be determined, dispersion not observed; nonpleochroic; X [and] c 0 to 7[degrees]. Chemical analytical data: Means of eighteen s ets of electron microprobe data (with [H.sub.2]0 calculated to give 12[H.sub.2]0): [Na.sub.2]O 14.80, [K.sub.2]O 0.05, MgO 0.14, CaO 0.20, MnO 11.20, FeO 0.15, [P.sub.2][O.sub.5] 35.23, [H.sub.2.sub.O] (36.46), Total (98.23) wt.%. Empirical formula: [([Mn.sub.0.95] [M.sub.0.02] [Fe.sub.0.01]).sub.[sigma]0.98] [([Na.sub.2.86] [Ca.sub.0.02] [K.sub.001]).sub.[sigma]2.89] [P.sub.2.98] [O.sub.9.87].12.13[H.sub.2]O. Relationship to other species: It is the natural equivalent of the synthetic triphosphate.

Name: For Aleksandr Anatol'evich Kanonerov (1955-), mining historian (Nizhnii Tagil Museum of Mining Industry of the Middle Urals) and mineral collector who first collected the mineral in 1995. Comments: IMA No. 1997-016.

POPOVA, V. I., POPOV, V. A., SOKOLOVA, E. V., FERRARIS, G., and CHUKANOV, N. V. (2002) Kanonerovite, [MnNa.sub.3][P.sub.3][O.sub.10]. 12[H.sub.O], first triphosphate mineral (Kazennitsa pegmatite, Middle Urals, Russia). Neues Jahrbuch fUr Mineralogie, Monatshefte 2002, 117-127.

Laflammeite

Monoclinic

[Pd.sub.3][Pb.sub.2][S.sub.2]

Locality: The Kirakkajuppura PGE deposit in the Penikat layered complex, Finland.

Occurrence: In altered pyroxenite. Associated minerals are: actinolite, clinochlore, chromite, vysotskite, zvyagintsevite, cuprorhodsite-ferrorhodsite-malanite, laurite-erlichmanite, irarsite, keithconnite, Pb-Pd-rich thiospinels of Cu, Fe, Rh and Ir, unnamed [Pd.sub.9][PbO.sub.10] and Rh[(Ni,Fe,Cu).sub.2][S.sub.3], palladian gold, chalcopyrite, bornite and millerite.

General appearance: Commonly as individual subhedral platelets (up to 150 [micro]m) and as intergrowths with members of the vysotskite-braggite series. The largest subhedral crystal is 0.3 mm.

Physical, chemical and crystallographic properties: Luster: metallic. Diaphaneity: opaque. Color: megascopic color unknown. Streak: dark gray. Hardness: [VHN.sub.50] 171 kg/[mm.sub.2], Mohs 3 1/2. Tenacity: quite brittle. Cleavage: inferred to be {010} perfect. Fracture: not given. Density: could not be determined, 9.41 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, by analogy with other parkerite-type phases probably C2/m, a 11.521, b 8.294, c 8.321 [Angstrom], [beta] 134.38[degrees], V 568.3 [[Angstrom].sup.3], Z 4, a:b:c 1.3891:1:1.0033. Morphology: no forms were observed. Twinning: finely twinned. X-ray powder diffraction data: 5.953 (6) (001), 4.144 (10) (020), 3.379 (4) (021), 2.917 (9) (220), 2.413 (8) (022), 2.365 (7) (422), 2.082 (5) (040). Optical data: In reflected light: cream with a brownish tint, weak anisotropism from brownish gray to grayish brown, weak bireflectance, nonpleochroic. [R.sub.1], [R.sub.2]; [R.sup.im.sub.1], [R.sup.im.sub.2]: (45.3, 46.2; 31.55, 32.45 %) 470nm, (46.5, 47.55; 32.6, 33.75 %) 546nm, (47.7, 48.8; 33.9, 55.05 %) 589nm, (49.6, 50.0; 36.0, 36.3 %) 650nm. Chemical analytical data: Means of twenty-six sets of electron microprobe data: Pd 39.16, Ir 1.08, Pb 52.01, S 7.90, Total 100.15 wt.%. Empirical formula: [([Pd.sub.2.96][Ir.sub.0.05]).sub.[SIGMA]3.01][Pb.sub.2.02][S.sub.1.9 8]. Relationship to other species: Possibly isostructural with parkerite, [Ni.sub.3][(Bi,Pb).sub.2][S.sub.2].

Name: For J. H. Gilles Laflamme (1947-), Mining and Mineral Sciences Laboratories, Canada Centre for Mineral and Energy Technology, Ottawa, Canada. Comments: IMA No. 2000-014.

BARKOV, A. Y., MARTIN, R. F., HALKOAHO, T. A. A., and CRIDDLE, A. J. (2002) Laflammeite, [Pd.sub.3][Pb.sub.2][S.sub.2], a new platinum-group mineral species from the Penikat layered complex, Finland. Canadian Mineralogist 40, 671-678.

Manganvesuvianite

Tetragonal

[Ca.sub.19][Mn.sup.3+][(Al,[Mn.sup.3+],[Fe.sup.3+]).sub.10][(Mg,[Mn.s up.2+]).sub.2][Si.sub.18][O.sub.69][(OH).sub.9]

Locality: The Wessels mine and the N'Chwaning II mine, Kalahari manganese fields, Republic of South Africa.

Occurrence: Crystals filling veins and vugs. At the N'Chwaning II mine, it is a rock-forming mineral intergrown with manganese-poor grossular or xonotlite and calcite in lenticular calcsilicate bodies within manganese ore beds. Additional associated minerals are: calcite, serandite-pectolite, strontiopiemontite-tweddillite, mozartite and hydrogrossular-henritermierite.

General appearance: Long prismatic crystals (up to 1.5 cm).

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: small crystals transparent, large crystals opaque. Color: small crystals red to lilac, large crystals nearly black. Streak: white. Luminescence: not mentioned. Hardness: 6 to 7. Tenacity: brittle. Cleavage: not observed. Fracture: subconchoidal. Density: not measured because of strong chemical zoning, 3.40 g/[cm.sup.3] (calc.). Crystallography: Tetragonal, P4/n, a 15.575, c 11.824 [Angstrom], V 2868.5 [[Angstrom].sup.3], Z 2, c:a = 0.7592. Morphology: {100} dominant, {110} minor, {101}. Twinning: none mentioned. X-ray powder diffraction data: not given because of the strong chemical zoning. Optical data: Uniaxial (-), [omega] 1.731, [epsilon] 1.719, pleochroism strong, O dark red, E yellowish. See COMMENTS. Chemical analytical data: Means of nineteen sets of electron microprobe data: [Na.sub.2] 0.02, MgO 2.35, CaO 35.73, CuO 0.02, SrO 0.11, [Al.sub.2][O.sub.3] 14.73, [Mn.sub.2][O.sub.3] 6.79, [Fe.sub.2][O.sub.3] 1.12, [SiO.sub. 2] 36.15, [H.sub.2]O 2.67, F 0.06, Cl 0.01, sum 99.76, less O = F + Cl 0.03, Total 99.73 wt.%. Empirical formula: [([Ca.sub.18.87][Sr.sub.0.03][Na.sub.0.02]).sub.[SIGMA]18.92][Mn.sup. 3+.sub.1.00][([Al.sub.8.38][Mn.sub.1.20.sup.3+][Fe.sub.0.42.sup.3+]). sub.[SIGMA]10.00]-[([Mg.sub.1.73][Mn.sub.0.35]).sub.[SIGMA]2.08][(Si. sub.17.82][Al.sub.0.18]).sub.[SIGMA]18.00][O.sub.69.12][[[(OH).sub.8. 78][F.sub.0.09][Cl.sub.0.01]].sub.[SIGMA]8.88]. See COMMENTS. Relationship to other species: It is a member of the vesuvianite group.

Name: For the chemical relationship to vesuvianite. Comments: IMA No. 2000-040. The symbols [omega] and [epsilon] are interchanged for 589 nm in the paper. No empirical formula is given in the paper, but the abstracter has produced the one given here. The crystal drawing was produced here from the information given in the paper and was approved by Prof. Armbruster.

ARMBRUSTER, T., GNOS, E., DIXON, R., GUTZMER, J., HEJNY, C., DOBELIN, N., and MEDENBACH, O. (2002) Manganvesuvianite and tweddillite, two new [Mn.sup.3+]-silicate minerals from the Kalahari manganese fields, South Africa. Mineralogical Magazine 66, 137-150.

Menshikovite

Hexagonal

[Pd.sub.3][Ni.sub.2][As.sub.3]

Locality: (1) The Vostok deposit, Lukkulaisvaara layered complex, northern Karelia, Russia and (2) the Chiney layered lopolith in the Kodar-Udokan horst, western Aldan Shield, Chita region, Siberia, Russia. A small grain has been identified also from the Oktyabr' deposit, Noril'sk complex, northern Siberia, Russia.

Occurrence: (1) In an altered gabbronorite associated mainly with chalcopyrite, pentlandite, violarite, actinolite and clinochlore; several other PGM species also occur here. (2) In mineralized quartz-feldspar sandstones associated mainly with biotite, amphibole and chlorite; numerous other PGM species and other sulfides also occur here.

General appearance: Anhedral grains (<5 [micro]m to 0.2 mm).

Physical, chemical and crystallographic properties: Luster: metallic. Diaphaneity: opaque. Color: megascopic color not given. Streak: not given. Hardness: [VHN.sub.40,50,65] 517.1 kg/[mm.sub.2], Mohs 5. Tenacity: brittle. Cleavage: not observed. Fracture. not given. Density: could not be determined, 5,32 g/[cm.sup.3] (calc.) for Z = 2 and 10.65 g/[cm.sup.3] (calc.) for Z =4. Crystallography: Hexagonal, [P6.sub.3]/m, [P6.sub.3] or [P6.sub.3]22, a 8.406, c 6.740 [Angstrom], V 412.4 [[Angstrom].sup.3], Z 2 or 4, c:a = 0.8018. Morphology: no forms were mentioned. Twinning: fine twins are present. X-ray powder diffraction data: 2.626 (10) (112), 2.477 (10) (202), 2.429 (8) (300), 2.283 (7) (301), 1.978 (7) (113), 1.818 (7) (400), 1.781 (7) (222). Optical data: In reflected light: pink sometimes with a slight grayish tint, weak anisotropism from light gray to brownish gray, no bireflectance, pleochroism not mentioned. [R.sub.1], [R.sub.2]; [R.sub.1.sup.im], [R.sub.2.sup.im]: (48.4, 50.2; 38.5, 39.3 %) 470nm, (51.2, 53.2; 41.0, 41.8 %) 546nm, (53.2, 55.3; 42.3, 43.3 %) 589nm, (56.6; 58.7, 46.6, 47.8 %) 650nm. Chemical analytical data: Means of ninety-eight sets of electron microprobe data: Ni 17.77, Fe 0.07, As 33.91, Pd 48.18, Pt 0.07, Total 100.00 wt.%. Empirical formula: [Pd.sub.2.99][([N.sub.2.00][Fe.sub.0.01])[SIGMA]2.01][As.sub.2.99]. Relationship to other species: None apparent. It may form a solid solution series with majakite, PdNiAs.

Name: For Dr. Yurii P. Men'shikov (1934-), Geological Institute of the Kola Science Center, Russian Academy of Sciences, Apatity, Russia.

Comments: IMA No. 1993-057.

BARKOV, A. Y, MARTIN, R. F., PAKHOMOVSKY, Y. A, TOLSTYKH, N. D., and KRIVENKO, A. P. (2002) Menshikovite, [Pd.sub.3][Ni.sub.2][As.sub.3], a new platinum-group species from two layered complexes, Russia. Canadian Mineralogist 40, 679-692.

Nabesite

Orthorhombic

[Na.sub.2][BeSi.sub.4][O.sub.10][4H.sub.2]O

Locality: On the Kvanefjeld Plateau, in the northwesternmost part of the Ilimaussaq alkaline complex, South Greenland.

Occurrence: In tugtupite-bearing albitites. Associated minerals are: aegirine, analcime, beryllite, bertrandite, chkalovite, epistolite, galena, manganoan pectolite, microcline, Na-komarovite, neptunite, pyrochlore, sphalerite and tugtupite. Crystal-lined cavities contain albite, nabesite, gmelinite, neptunite, analcime, gonnardite, lovdarite, an unidentified phase presumed to be trona and possibly opal.

General appearance: Crystals range from 0.05 x 0.5 x 0.5 to 0.2 x 5 x 5 mm and occur as aggregates (up to5x 10 x 10 mm) of thin platy crystals in parallel or subparallel orientation.

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity. transparent. Color: colorless. Streak: white. Luminescence: nonfluorescent. Hardness: 5 to 6. Tenacity: brittle. Cleavage: {110} and {001} good. Fracture: uneven. Density: 2.16 g/[cm.sup.3] (meas.), 2.22 g/[cm.sup.3] (calc.). Crystallography: Orthorhomhic, [P2.sub.1][2.sub.1][2.sub.1], a 9.722, b 10.142, c 12.030 A, V 1186.2 [A.sup.3], Z 4, a:b:c = 0.9586:1:1.1862. Morphology: {100}, {010}, {001}, {111} and {111}; platy on {001}. Twinning: none mentioned. X-ray powder diffraction data: 6.11B (80) (111), 5.97 (100) (002), 5,07 (35) (020), 3.46 (45) (113), 3.09D (70) (310, 131), 3.06 (50) (222, 004), 2.988D (60) (311). B = broad, D = double. Optical data: Biaxial (-), [alpha] 1.499, [beta] 31.507, [gamma] 1.511, 2V(meas.) 65[degrees], 2V(calc.) 70[degrees]; no dispersion; no pleochroism; orientation, X = a, Y = c, Z = b. Chemical analytical data: Means of three sets of electron microprobe data ([Na.sub.2]O by SEM-EDS, BeO and [H. sub.2]O calculated from the ideal formula derived by crystal structure analysis): [Na.sub.2]O 13.8, [K.sub.2]O 0.34, BeO (6.26), CaO 0.13, Si[O.sub.2] 62.4, [H.sub.2]O (18.05), Total (100.98) wt.%. Empirical formula: ([Na.sub.1.75][K.sub.0.03-[Ca.sub.0.01])[[sigma]1.79][Be.sub.0.98][Si .sub.4.09][O.sub.10.06 3.94[H.sub.2]O. Relationship to other species: It is a member of the zeolite group and is related to weinebeneite, [CaBe.sub.3]([PO.sub.4]).sub.2][(OH).sub.2][4H.sub.2]O.

Name: For the chemical composition: Na, Be and Si. Comments: IMA No. 2000-024.

PETERSEN, O. V., GIESTER, G., BRANDSTATTER, F., and NIEDERMAYR, G. (2002) Nabesite, [Na.sub.2][BeSi.sub.4][O.sub.10][4H.sub.2]O, a new mineral species from the Ilimaussaq alkaline complex, South Greenland. Canadian Mineralogist 40, 173-181.

Neustadtelite

Triclinic

[Bi.sub.2][Fe.sup.3]+[Fe.sup.3]+[O.sub.2][(OH).sub.2][(As[O.sub.4]).s ub.2]

Locality: The dumps of the Guldener Falk mine near Schneeberg-Neustadtel, Schneeberg area, Saxony, Germany. It also has been found on the dumps of other mines in the area: Siebenschlecken, Junge Kalbe, Friedefurst and Peter und Paul.

Occurrence: Associated minerals are: quartz, cobaltneustadtelite, preisingerite and goethite; rarely with mixite, zeunerite and bismutite.

General appearance: Crystal aggregates (up to 0.3 mm) and as very small tabular crystals usually <0.1 mm thick.

Physical, chemical and crystallographic properties: Luster: adamantine. Diaphaneity: transparent to translucent. Color: brown. Streak: light brown. Luminescence: nonfluorescent. Hardness: 4 1/2. Tenacity: brittle. Cleavage: {001} good on some crystals. Fracture: conchoidal. Density: could not be measured, 5.81 [g/cm.sup.3] (calc.). Crystallography: Triclinic, P1, a 4.556, b 6.153, c 8.984 A, [alpha] 95.43[degrees], [beta] 99.20[degrees],[gamma] 92.95[degrees], V246.9 [A.sup.3], Z 1, a:b:c = 0.7405:1:1.4601. Morphology: {001}, {101} and "{011}"; the latter form could not be measured accurately and may be {153}. Twinning: none observed. X-ray powder diffraction data: 8.827 (67) (001), 3.766 (83) (012, 101, 110), 3.542 (94) (111), 3.505 (87) (110, 111), 2.913 (100) (102), 2.798 (48) (021), 2.668 (72) (103), 2.549 (43) (013), 1.767 (46) (222, 005).

Optical data: Biaxial (-), [alpha] 2.02, [beta] 2.09 (calc.), [gamma] 2.12, 2V(meas.) 65[degrees], no distinct dispersion observed; pleochroism strong, X = brown to opaque, Y = yellow, Z = pale yellow; [PHI] and p relative to (010) X = .3[degrees] and 79[degrees], Y = -107[degrees] and 37[degrees], Z = 95[degrees] and 55[degrees]. Chemical analytical data: Means of thirteen sets of electron microprobe data: CaO 0.15, NiO 0.34, CoO 3.35, CuO 0.07, ZnO 0.09, PbO 0.08, [Al.sub.2][O.sub.3] 0.29, [Fe.sub.2][O.sub.3] 13.92, [Bi.sub.2][O.sub.3] 52.58, [P.sub.2][O.sub.5] 0.23, [AS.sub.2][O.sub.5] 26.82, [H.sub.2]O 2.56, Total 100.48 wt. %. Empirical formula: ([Bi.sub.1.94][Ca.sub.0.02])[[sigma].sub.1.96][Fe.sub.1.00](Fe.sub.0. 50][Co.sub.0.38][Al.sub.0.05][Ni.sub.0.04][Zn.sub.0.01][Cu.sub.0.01)[ [sigma].sub.0.99][(OH).sub.2.44)[O.sub.1.40][[sigma].sub.3.84][[(AsO. sub.4]).sub.2.01]([PO.sub.4]).sub.0.03][[sigma].sub.2.04. Relationship to other species: It is a member of the medenbachite group, specifically the [Fe.sup.3+ ]-dominant member.

Name: For the locality. Comments: IMA No. 1998-016.

KRAUSE, W., BERNHARDT, H.-J., McCAMMON, C., and EFFENBERGER, H. (2002) Neustadtelite and cobaltneustadtelite, the [Fe.sup.3+]- and [Co.sup.2+]-ana1ogues of medenbachite. American Mineralogist 87, 726-738.

Nickelschneebergite

Monocinic

[BiNi.sub.2](As[O.sub.4])2[([H.sub.2]O)(OH)]

Locality: The mining area known as "Am Roten Berg," approximately 4.8 km southwest of the center of Schneeberg, Saxony, Germany.

Occurrence: In small vugs of coarse quartz with no other associated minerals. On other schneebergite/nickelschneebergite specimens the associated minerals are: cobaltoan/nickeloan ferrilotharmeyerite, cobaltlotharmeyerite, nickellotharmeyerite, preisingerite, waylandite and zeunerite.

General appearance: Aggregates (up to 1 mm) and tabular elongated crystals ([greater than or equal to] 0.5 mm).

Physical, chemical and crystallographic properties: Luster: adamantine. Diaphaneity: transparent. Color: brown to beige. Streak: light brown to nearly white. Luminescence: non-fluorescent. Hardness: [VHN.sub.15] 250 kg/[mm.sup.2], Mobs 4 to 4 1/2. Tenacity: brittle. Cleavage: none observed. Fracture: conchoidal. Density: could not be measured, 5.23 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, C2/m, a 8.995, b 6.207, c 7.462 [Angstrom], [beta] 115.00[degrees], V 377.6 [[Angstrom].sup.3], Z 2, a:b:c = 1.4492:1:1.2022. Morphology: {201}, {001}, {l01}, {101}, {111}, tabular on {201} and elongated on [010]. Twinning: none observed. X-ray powder diffraction data: 6.759 (29) (001), 4.5 86 (40) (111), 3.196 (100) (112), 2.980 (72) (201), 2.821 (44) (021), 2.507 (47) (112), 1.877 (28) (113), 1.702 (57) (331, 404, 511), 1.673 (30) (423). Optical data: Biaxial (-), [alpha] 1.92 (calc.), [beta] 1.95, [gamma] 1.97, 2V(meas.) 77[degrees], dispersion not determined; pleochroism weak, Y light brown, X and Z pale yellow ; X [approximately equal to] c, Y = b, Z ^ a = 25[degrees] in obtuse angle [beta]. Chemical analytical data: Means of seven sets of electron microprobe data: CaO 2.68, NiO 14.75, CoO 7.98, ZnO 0.09, PbO 0.09, [Fe.sub.2][O.sub.3] 2.19, [Bi.sub.2][O.sub.3] 28.54, [P.sub.2][O.sub.5] 0.08, [As.sub.2][O.sub.5] 38.26, [H.sub.2]O 4.72, Total 99.64 wt,%. Empirical formula: [([Bi.sub.073][Ca.sub.0.29][Pb.sub.001]).[SIGMA].sub.1.02] [([Ni.sub.1.18][Co.sub.0.64][Fe.sub.0.16]).[SIGMA].sub.2.03][([[ASO.s ub.4]).sub.1.99.sup.-] [[([PO.sub.4]).sub.0.01]].sub.[SIGMA]2.00][[([H.sub.2]O].sub.1.10][(O H).sub.0.93].sub.[SIGMA]2.03]. Relationship to other species: It is a member of the tsumcorite group, specifically the Bi-dominant analogue of nickellothanneyerite.

Name: For the relationship with schneebergite. Comments: IMA No. 1999-028. Dr. Krause kindly supplied the SHAPE data for the drawing produced here.

KRAUSE, W., BERNHARDT, H.-J., EFFENBERGER, H., and WITZKE, T. (2002) Schneebergite and nickelschneebergite from Schneeberg, Saxony, Germany: the first Bi-bearing members of the tsumcorite group. European Journal of Mineralogy 14, 115-126.

Schneebergite Monoclinic

[BiCo.sub.2]([AsO.sub.4]).sub.2][([H.sub.2]O)(OH])]

Locality: The mining area known as "Am Roten Berg," approximately 4.8 km southwest of the center of Schneeberg, Saxony, Germany.

Occurrence: In small vugs of coarse quartz associated with scorodite and barium-pharmacosiderite. On other schneebergite/ nickelscbneebergite specimens the associated minerals are: cobaltoan/nickeloan ferrilotharmeyerite, cobaltlotharmeyerite, nickellotharmeyerite, preisingerite, waylandite amd zeunerite.

General appearance: Aggregates (up to 1 mm) and tabular elongated crystals ([less than or equal to] 0.5 mm).

Physical, chemical and crystallographic properties: Luster: adamantine. Diaphaneity: transparent. Color: brown to beige. Streak: light brown to nearly white. Luminescence: non-fluorescent. Hardness: [VHN.sub.15] 250 kg/[mm.sup.2], Mohs 4 to 4 1/2. Tenacity: brittle. Cleavage: none observed. Fracture: conchoidal. Density: could not be measured, 5.28 g/[cm.sup.3] (calc.). Crystallography: Monodilnic, C2/m, a 9.005, b 6.211, c 7.440 [Angstrom], [beta] 115.19[degrees], V 376.5 [[Angstrom].sup.3], Z 2, a:b:c = 1.4498:1:1.1979. Morphology: {201}, {001}, {102}, (111}, tabular on {201} and elongated on [010]. Twinning: none observed. X-ray powder diffraction data: 4.589 (61) (111), 3.193 (100) (112), 2.971 (92) (201), 2.820 (61) (021), 2.702 (57) (311), 2.498_(62) (112, 310), 1.704 (52) (331, 404,511), 1.674 (51) (004,423). Optical data: Biaxial (+), a 1.93 (calc.), [beta] 1.95, [gamma] 1.98, 2V(meas.) 85[degrees], dispersion not determined; pleochroism distinct, Y brown, X and Z pale yellow; X [approximately equal t o] c, Y = b, Z ^ a = 25[degrees] in obtuse angle [beta]. Chemical analytical data: Means of twelve sets of electron microprobe data: CaO 2.72, NiO 9.35, CoO 13.31, PbO 0.11, [Fe.sub.2][O.sub.3] 2.95, [Bi.sub.2][O.sub.3] 29.01, [As.sub.2][O.sub.5] 38.42, [SO.sub.3] 0.11, [H.sub.2]O 4.40, Total 100.38 wt.%. Empirical formula: [([Bi.sub.0.74][Ca.sub.0.29]).sub.[SIGMA]1.03.sup.-] [([Co.sub.1.06][Ni.sub.0.75][Fe.sub.0.22]).sub.[SIGMA]2.03][[([ASO.su b.4]).sub.1.99)][([SO.sub.4].sub.0.01]].sub.[SIGMA]2.00][[([H.sub.2]O ).sub.0.91][[(OH).sub.1.09].sub.[SIGMA]2.00]. Relationship to other species: It is a member of the tsumcorite group, specifically the Bi-dominant analogue of cobalfiotharmeyerite.

Name: For the locality. The name was used long ago for a mineral which was shown to be romeite and now has been approved by the CNMMN IMA for the present use. Comments: IMA No. 1999-027. Dr. Krause kindly supplied the SHAPE data for the drawing produced here.

KRAUSE, W., BERNHARDT, H.-J., EFFENBERGER, H., and WITZKE, T. (2002) Schneebergite and nickelschneebergite from Schneeberg, Saxony, Germany: the first Bi-bearing members of the tsumcorite group. European Journal of Mineralogy 14, 115-126.

Symesite Triclinic

[Pb.sub.10]([SO.sub.4])[O.sub.7][Cl.sub.4][H.sub.2]O

Locality: Merehead Quarry, Somerset, England, United Kingdom (Lat. 51[degrees]12' N, Long. 2[degrees]26' W).

Occurrence: In veins of manganese and iron oxide minerals cutting limestone. Associated minerals are: cerussite, hydrocerussite, paralaurionite, blixite, chloroxiphite, pyrolusite, coronadoite, hematite, parkinsonite and mereheadite.

General appearance: Blebby crystals up to 2 mm long and polycrystalline aggregates up to 1 cm in diameter.

Physical, chemical and crystallographic properties: Luster: given as vitreous but the indices of refraction indicate adamantine. Diaphaneity: translucent. Color: pink ("Venetian pink"). Streak: white. Luminescence: not given. Hardness: 4. Tenacity: not given. Cleavage. (001} perfect. Fracture: not given. Density: 7.3 g/[cm.sup.3] (meas.), 7.26 g/[cm.sup.3] (calc.). Crystallography: Triclinic, B1, a 19.727, b 8.796, c 13.631 [Angstrom], [alpha] 82.21[degrees], [beta] 78.08[degrees], [gamma] 100.04[degrees], V 2242.4 [[Angstrom].sup.3], Z 4, a:b:c = 2.2427:1:1.5497. Morphol ogy: no forms were mentioned. Twinning: none mentioned. X-ray powder diffraction data: 6.573 (4) (002), 3.768 (4) (412, 321), 3.286 (9) (004), 2.955 (9) (412, 323), 2.911 (10) (414, 323), 2.793 (8) (131, 711). Optical data: The indices of refraction are higher than 2 so optical characterization was done in polarized reflected light. It is gray, nonbireflectant, nonpleochroic and very weakly anisotropic. [R.sub.1], [R.sub.2]; [[blank].sup.im] [R.sub.1], [[blank].sup.im][R.sub.2]: (15.20, 16.30; 4.07, 4.67) 470 nm, (14.20, 15.30; 3.59, 4.17), 546 nm, (13.90, 15.00; 3.44,4.02), 589 nm, (13.70, 14.70; 3.37, 3.91), 650 nm. Indices of refraction calculated from the reflectance data are [n.sub.1] 2.15 and [n.sub.2] 2.18 at 590 nm. Chemical analytical data: Means of 17 sets of electron microprobe data: PbO 90.66, [SO.sub.3] 3.15, [H.sub.2]O (0.73), Cl 5.83, sum 100.37, less O = Cl 1.32, Total (99.05) wt.%. [H.sub.2]O was calculated here to give 1([H.sub.2]O). Empirical formula: [Pb.sub.10.05][([SO.sub.4]).sub.097][O.sub.7.05][Cl.sub.4.07][([H.sub .2]O).sub.1.00]. Relationship to other species: It is a Pb-sheet mineral similar to nadorite, PbSb[O.sub.2]Cl, mereheadite, [Pb.sub.2]O(OH)Cl, and thorikosite, ([Pb.sub.3][Sb.sub.0.6][As.sub.0.4])[O.sub.2](OH)[C1.sub.2].

Name: For Robert Symes (1937-.), Department of Mineralogy, Natural History Museum, London, in recognition of his many contributions to the mineralogy of the ore deposits of SouthWest England. Comments: NA No. 1998-035.

WELCH, M. D., COOPER, M. A., HAWTHORNE, F. C., and CRIDDLE, A. J. (2000) Symesite, [Pb.sub.10]([SO.sub.4])[O.sub.7][C1.sub.4]([H.sub.2]O), a new PbO-related sheet mineral: Description and crystal structure. American Mineralogist 85, 1526-1533.

Tatyanaite

Orthorhombic

[(Pt,Pd,Cu).sub.9][Cu.sub.3][Sn.sub.4]

Locality: The Oktyabr'sky deposit, Noril'sk complex, northern Siberia, Russia.

Occurrence: In massive sulphide ore. Associated minerals are: chalcopyrite, a chalcopyrite-like sulphide (e.g., mooihoekite, talnakhite or putoranite), pentlandite, pyrrhotite, cubanite, galena, talmyrite, cabriite, stannopalladinite, atokite-rustenburgite, paolovite, froodite, sperrylite, maslovite, Ag-Au alloy, Fe-rich hydrous silicate, magnetite and calcite.

General appearance: Central zones of large elongate grains (up to ~1 cm) and as aggregates of smaller, irregular or platy grains.

Physical, chemical and crystallographic properties: Luster: metallic. Diaphaneity: opaque. Color: megascopic color not given. Streak: not given. Hardness: [VHN.sub.20] 327 kg/[mm.sup.2], Mohs 3 1/2 to 4. Tenacity: rather ductile. Cleavage: none observed. Fracture: not given. Density: not measured, 13.55 g/[cm.sup.3] (calc.). Crystallography: Orthorhombic, Pmmm, Pmm2 or P222 (by analogy with synthetic material), a 7.89, b 4.07, c 7.73 A, V248 [A.sup.3], Z 1, a:b:c = 1.9386:1:1.8993. Morphology: no forms were mentioned. Twinning: polysynthetic. X-ray powder diffraction data: 2.283 (10) (212), 2.163 (4) (203), 2.030 (2) (020), 1.369 (3) (323), 1.218 (2) (405, 232), 1.143 (2) (424). Optical data: In reflected light: pink with a lilac tinge, distinct to moderate anisotropism, weak to distinct bireflectance, pleochroic from brownish pink to pinkish lilac. [R.sub.1] & [R.sub.2]: (42.8, 44.1 %) 470nm, (49.5, 50.0 %) 546nm, (51.8, 54.6 %) 589nm, (55.6, 56.8 %) 650nm. Chemical analytical data: Two sets of electron microprobe data are given. The means of one set are: Pt 45.38, Pd 19.53, Cu 10.62, Fe 0.03, Ni 0.15, Sn 23.02, Sb 0.27, Pb n.d., Total 99.00 wt.%. Empirical formula: [[([Pt.sub.4.76][Pd.sub.3.75])[[sigma]8.51][Cu.sub.048].sub.[[sigma]8 .99]][([Cu.sub.294][Ni.sub.0.05][Fe.sub.0.01])[[sigma]3.00],[([Sn.sub .3.97][Sb.sub.0.05]).sup.[[sigma].sub.4.02]]. Relationship to other species: The platinum-dominant analogue of taimyrite, [Pd.sub.9][Cu.sub.3][Sn.sub.4].

Name: For Dr. Tatyana L. Evstigneeva (or Yevstigneeva) (1945-) of the Russian Academy of Sciences, who has studied the minerals of the Noril'sk deposit for many years. Comments: NA No. 1995-049a.

BARKOV, A. Y, MARTIN, R. F., POIRIER, G., TARKIAN, M., PAKHOMOVSKLI, YA., and MEN'SHIKOV, YU. P. (2000) Tatyanaite, a new platinum-group mineral, the Pt analogue of taimyrite, from the Noril'sk complex (northern Siberia, Russia). European Journal of Mineralogy 12, 391-396.

Thomsonite-Sr

Orthorhombic

[(Sr,Ca).sup.2]Na[[A1.sub.5][Si.sub.5][O.sub.20]]. 6-7[H.sub.2]O

Locality: At Rasvumchorr Mt. and Yuksporr Mt., Khibiny alkaline massif, Kola Peninsula, Russia.

Occurrence: At Rasvumchorr, in veinlets cross-cutting natrolite of ristscorrite pegmatite; associated minerals are: microcline, aegirine, annite, astrophyllite, magnetite, fluorapatite, pyrophanite, thomsonite-Ca, etc. At Yuksporr, in a veinlet crosscutting urtite, as zones in thomsonite-Ca; associated minerals are: calcite, fluorapophyllite, tobermorite, thaumasite and barite.

General appearance: Euhedral crystals up to 0.2 x 0.2 mm (Rasvumchorr) and zones up to 0.02 mm (Yuksporr).

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: transparent. Color: colorless. Streak: white. Luminescence: nonfluorescent. Hardness: 5. Tenacity: brittle. Cleavage: {100} perfect, {010} good. Fracture: uneven. Density: 2.47 g/[cm.sup.3] (meas.), 2.62 g/[cm.sub.3] (calc.). Crystallography: Orthorhombic, Pcnn, a 13.050, b 13.123, c 13.241 A, V 2268 [A.sup.3], Z 4, a:b:c = 0.9944:1:1.0090. Morphology: {100}, {010}, {001}, {110}, {101}, {01l}. Twinning: none observed. X-ray powder diffraction data: 6.63 (7) (002), 4.66 (8) (020, 220), 3.49 (9) (312, 321), 3.19 (8) (223, 232, 322), 2.960 (10) (024, 204, 042), 2.860 (10) (142, 241, 412), 2.691 (10) (242), 2.186 (7) (244, 060,600). Optical data: Biaxial (+), a 1.528, P 1.532, y 1.540, 2V(meas.) 62[degrees], 2V(calc.) 71[degrees]; dispersion r> v, weak; nonpleochroic; orientation, X = a, Y = c, Z = b. Chemical analytical data: Means of ten sets of electron microprobe data: [Na.sub.2]O 3.22, [K.sub.2]O 0.14, CaO 3.85, SrO 16.27, BaO 0.24, [A1.sub.2][O.sub.3] 27.65, [Fe.sub.2][O.sub.3] 0.03, Si[O.sub.2] 33.51, [H.sub.2]O 14.10, Total 99.01 wt.%. Empirical formula: [([Sr.sub.1.42][Ca.sub.0.62][Ba.sub.0.01]).sub.[[sigma]2.05]],[([Na.s ub.0.94][K.sub.0.03]).sup.[[sigma].sub.0.97]][Si.sub.5.03]-[Al.sub.4. 89][O.sub.19.94]].7.06[H.sub.2]O. Relationship to othe r species: It is a member of the zeolite group, specifically the thomsonite series.

Name: For the relationship to other members of the thomsonite series. Comments: IMA No. 2000-025.

PEKOV, I. V., LOVSKAYA, E. V., TURCHKOVA, A. G., CHUKANOV, N. V., ZADOV, A. E., RASTSVETAEVA, R. K., and KONONKOVA, N. N. (2001) Thomsonite-Sr [(Sr,Ca).sub.2]Na[[Al.sub.5][Si.sub.5][O.sub.20].6-7[H.sub.2]O, a new zeolite mineral from the Khibiny massif (Kola Peninsula) and thomsonite-Ca--thomsonite-Sr an isomorphous series. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva 130(4), 46-55.

Tischendorfite

Orthorhombic

[Pd.sub.8][Hg.sub.3][Se.sub.9]

Locality: The Eskaborner Stollen (Eskeborn adit), at the 60-meter level, 5 meters north of the blind shaft IV, near Tilkerode, Harz Mountains, Germany.

Occurrence: In telethermal selenide veins. Associated minerals are: chrisstanleyite, tiemannite, clausthalite, stibiopalladinite, gold, ankerite and calcite.

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

Physical, chemical and crystallographic properties: Luster: metallic. Diaphaneity: opaque. Color: megascopic color unknown. Streak: black. Hardness: could not be determined because of complex intergrowth with other minerals, but it has a polishing hardness similar to that of chrisstanleyite, greater than that of tiemannite and clausthalite, but lower than that of stibiopalladinite. Tenacity: brittle. Cleavage: not given. Fracture: uneven. Density: could not be measured, 9.13 g/[cm.sup.3] (calc.). Crystallography: Orthorhombic, Pmmn, P[2.sub.1]mn or Pm[2.sub.1]n, a 7.219, b 16.782, c 6.467 A, V 783.6 [A.sup.3], Z 2, a:b:c = 0.4302:1:0.3854. Morphology: no forms were mentioned. Twinning: none observed. X-ray powder diffraction data: 4.819 (40) (101), 4.373 (40) (130), 2.797 (60) (032, 122), 2.743 (100) (151, 231, 240), 2.325 (40) (052), 2.116(40) (062), 2.091 (100) (261). Optical data: In reflected light: cream or slightly beige, weak anisotropism, weak bireflectance, nonpleochroic. [R.sub.1], [R.sub.2]; [R.sup .im.sub.1], [R.sup.im.sub.2]: (46.8, 51.3; 33.9, 38.3 %) 470nm, (49.4, 53.1; 35.9, 39.5 %) 546nm, (49.9, 53.25; 36.5, 39.9 %) 589nm, (48.95, 52.55; 35.7, 39.6 %) 650nm. Chemical analytical data: Means of four sets of electron microprobe data: Cu 0.2, Se 32.0, Pd 39.4, Pt 0.1, Ag 1.0, Hg 24.9, Pb 1.4, Total 99.0 wt.%. Empirical formula: [([Pd.sub.8.05][Pt.sub.0.01]).sub.[SIGMA]8.06][([Hg.sub.2.70][Ag.sub. 0.20][Pb.sub.0.15][Cu.sub.0.07]).sub.[[SIGMA]3.12.sup.-]] [Se.sub.8.82]. Relationship to other species: None apparent.

Name: For Dr. Gerhard Tischendorf (1927-), formerly at GeoForschungsZentrum, Potsdam, Germany, for his many contributions to mineralogy and geochemistry and particularly his studies of the formation of selenide deposits of the Harz Mountains. Comments: IMA No. 2001-061.

STANLEY, C. J., CRIDDLE, A. J., FORSTER, H.-J., and ROBERTS, A. C. (2002) Tischendorfite, [Pd.sub.8][Hg.sub.3][Se.sub.9], a new mineral species from Tilkerode, Harz Mountains, Germany. Canadian Mineralogist 40, 739-745.

Turtmannite

Trigonal

[(Mn,Mg).sub.22.5][Mg.sub.3-3x][[(V,As)[O.sub.4]].sub.3][[As[O.sub.3] ].sub.x] [O.sub.5-5x][(OH).sub.20+x]

Locality: The Turtmann valley, Valais, Switzerland.

Occurrence: In jacobsite-rich Fe-Mn ores in Triassic marbles. Associated minerals are: jacobsite, kutnohorite, barite, tephroite and spessartine.

General appearance: In micaceous flakes (op to 200 [micro]n long).

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: transparent. Color: bright yellow. Streak: white. Luminescence: nonfluorescent. Hardness: could not be measured. Tenacity: very brittle. Cleavage: {001} perfect. Fracture: not given. Density: 3.60 to [4.0.sub._]g/[cm.sup.3] (meas.), 3.66 g/[cm.sup.3] (calc.). Crystallography: Trigonal, [R.sup.-]3c, a 8.259, c 204.3 A, V 12068 [A.sup.3], Z 12, c:a 24.7367. Morphology: no forms were mentioned. Twinning: none mentioned. X-ray powder diffraction data: 2.99 (40) (0.1.62), 2.83 (40) (2.2.44), 2.69 (80) ([3.sup.-][1.sup.-]1), 2.43 (60) (0.0.84), 2.38 (80) (1.[2..sup.-][4.sup.-] 0), 1.561 (100) (140). Optical data: Uniaxial (-), [omega] 1.787, [epsilon] could not be measured, Chemical analytical data: Means of fourteen sets of electron microprobe data: MgO 5.27, CaO 0.08, MnO 57.29, NiO 0.21, CoO 0.13, ZnO 0.06, BaO 0.05, [Al.sub.2][O.sub.3] 0.69, Si[O.sub.2] 8.61, [V.sub.2][O.sub.5] 8.09, [As.sub.2][O.sub.5] 7.47, [H.sub.2]O (8.06), T otal 96.01 wt.%. This is a complex mineral and the derivation of an empirical formula is impossible without more information on the subtleties of the structure. Relationship to other species: It is probably related to mcgovernite.

Name: For the locality. Comments: IMA No. 2000-007.

BRUGGER, J., ARMBRUSTER, T., MEISSER, N., HEJNEY, C., and GROBETY, B. (2001) Description and crystal structure of turtmannite, a new mineral with a 68 A period related to mcgovernite. American Mineralogist 86, 1494-1505.

Tweddillite

Monoclinic

CaSr[([Mn.sup.3+], [Fe.sup.3+]).sub.2] AI[[Si.sub.3][O.sub.12]](OH)

Locality: The Wessels mine, Kalahari manganese field, Republic of South Africa.

Occurrence: In calcsilicate rocks formed as hydrothermal alteration of primary sedimentary manganese ore. Associated minerals are: serandite-pectolite and braunite.

General appearance: "Suns" of very thin (~0.02 mm) radiating blades (up to 0.5 mm long).

Physical, chemical and crystallographic properties: Luster: given as vitreous, but the optical data indicate adamantine. Diaphaneity: not given but probably translucent. Color: deep dark red. Streak: brownish red. Luminescence: not given. Hardness: 6 to 7. Tenacity. brittle. Cleavage: {001} perfect. Fracture: subconchoidal. Density: not measured because of strong chemical zoning, 3.89 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, P[2.sup.1]/m, a 8.934, b 5.718, c 10.325 A, [beta] 114.54[degrees], V 479.8 [A.sup.3], Z 2, a:b:c = 1.5624:1:1.8057. Morphology: {001} elongated parallel to [010]. Twinning: on (100). X-ray powder diffraction data: 3.513 (50) (211), 2.936 (100) (113), 2.854 (40) (020), 2.703 (80)(300), 2.586 (80)(202), 2.182 (80)(401), 2.149 (40)(221). Optical data: Biaxial (+), average n 1.825, 2V could not be measured, dispersion not given; pleochroism strong, within the (001) blades dark red parallel to b and orange-yellow parallel to a, perpendicular to (001) the blades appear magenta to red ; orientation could not be determined. Chemical analytical data: Four sets of electron microprobe data are given. The data for material with the lowest Al-content ([H.sub.2]O calculated): [Na.sub.2]O 0.01, [K.sub.2]O 0.01, CaO 9.78, SrO 18.18, BaO 0.10, PbO 1.42, [Al.sub.2][O.sub.3] 9.35, [Mn.sub.2][O.sub.3] 21.32, [Fe.sub.2][O.sub.3] 5.80, Si[O.sub.2] 32.50, [H.sub.2]O (1.48), Cl 0.01, sum 99.96, less O = Cl 0.00, Total (99.96) wt. %. Empirical formula: [([Ca.sub.0.98][Pb.sub.0.04]).sub.[SIGMA]1.02][Sr.sub.0.99][([Mn.sub. 3+.sub.1.52][Fe.sub.3+.sub.0.41]).sub.[SIGMA]1.93][Al.sub.1.03.sup.-] [[Si.sub.3.04][O.sub.12.10]][(OH).sub.0.92]. Relationship to other species: It is a member of the epidote group.

Name: For Samuel Milbourn Tweddill FGS, first curator of the Museum of the Geological Survey, Pretoria, Republic of South Africa. He ran the museum from 1897 to 1916. Comments: IMA No. 2001-014.

ARMBRUSTER, T., GNOS, E., DIXON, R., GUTZMER, J., HEINY, C., DOBELIN, N., and MEDENBACH, 0. (2002) Manganvesuvianite and tweddillite, two new [Mn.sup.3+]-silicate minerals from the Kalahari manganese fields, South Africa. Mineralogical Magazine 66, 137-150.

[NaMg.sub.3][V.sub.6][[Si.sub.6][O.sub.18][[[BO.sub.3]].sub.3][(OH).s ub.4]

Locality: The Sludyanka complex, southern Lake Baikal region, Russia.

Occurrence: In chromium-vanadium-bearing calcite-quartz-diop-side metamorphic rocks. Associated minerals are: quartz, calcite, chromian-vanadian diopside, tremolite, di-and tri-octahedral micas, Mg-Fe-V-Cr spinels, uvarovite-goldmanite, eskolaite-karelianite, kosmochlor-natalyite, vanadian titanite and anatase, chromian-vanadian dravite, pyrite, barite and some unnamed minerals.

General appearance: Euhedral and subhedral crystals (up to 0.20 mm).

Physical, chemical and crystallographic properties: Luster: resinous. Diaphaneity: Transparent to opaque. Color: dark green to black. Streak: yellowish-brownish. Luminescene: not given. Hardness: [VHN.sub.50] 1417 kg/[mm.sup.2], Mohs ~7 1/2. Tenacity: brittle. Cleavage: {101} and {110} imperfect; parting {001}. Fracture: conchoidal. Density: 3.32 g/[cm.sup.3] (meas.), 3.32 g/[cm.sup.3] (calc.). Crystallography: Trigonal, R3m, a 16.12, c 7.39 A, {101}, {021}. Twinning: none observed. X-ray powder diffraction data: 6.54 (9) (101), 4.04 (8)(220), 3.57 (7) (012), 3.04(9) (410), 2.62 (10)(051), 2.07(9)(152), 1.951 (5)(342). Optical data: Means of twelve sets of electron microprobe data: [Na.sub.2]O 2.64, [K.sub.2]O 0.32, MgO 7.76, CaO 0.05, MnO 0.02, FeO 1.02, [B.sub.2][O.sub.3] 9.47, [Al.sub.2][O.sub.3] 4.55, [V.sub.2][O.sub.3] 35.12, [Cr.sub.2][O.sub.3] 4.12, [SiO.sub.2] 32.21, [TiO.sub.2] 0.36, [H.sub.2]O 2.57, F 0.24, sum 100.45, less O = F 0.10, Total 100.35 wt.% Empirical formula: [([Na.sub.0.94][K.sub.0.07- ][Ca.sub.0.01]).sub.[SIGMA]1.02][(Mg.sub.2.12][Fe.sub.0.16][Cr.sub.0. 60][V.sub..sub.0.12]).sub.[SIGMA]3.00][( V.sub.5.05][Al.sub.0.89][Ti.sub.0.05]).sub.[SIGMA]5.99][([Si.sub.5.91 ][Al.sub.0.09])-[O.sub.18.00]][[[BO.sub.3].sub.3.00][[[(OH).sub.3.15] [O.sub.0.71][F.sub.0.14]].sub.[SIGMA]4.00-] Relationship to other species: It is the [V.sup.3+]-dominate analogue of dravite and a member of the tourmaline group.

Name: For the composition and relationship to dravite. Comments: IMA No. 1999-050.

REZNITSKY, E. Z., SKLYAROV, E. V., USHCHAPOVSKAYA, Z. F., NARTOVA, N. V., KASHAEV, A. A., KARMANOV, N. S., KANAKIN, S. V., SMOLIN, A. S., AND NEKRASOVA, E. A. (2001) Vanadiumdravite, [NaMg.sub.3] [V.sub.6][[Si.sub.6][O.sub.18]][[[BO.sub.3].sub.3][(OH).sub.4], a new mineral of the tourmaline group. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva 130(2), 59-72.

Verbeekite

Monoclinic

[PdSe.sub.2]

Locality: The dumps of the Musonoi Cu-Co-Mn-U mine, western portion of Shaba (formerly Katanga) Province, near Kolwezi, Democratic Republic of Congo (formerly Zaire); approximately at Lat. 10[degrees]44' S and Long. 24[degrees]26' E. Also at Hope's Nose, Torquay, Devon, England, UK (Lat. 58[degrees]28' N, Long. 3[degrees]28' W).

Occurrence: A primary phase formed from hydrothermal solutions at temperatures up to 120[degrees]C. The only directly associated mineral is oosterboschite. Other closely associated minerals are cuprian and palladian trogtalite, selenian digenite and selenian covellite. At Hope's Nose, verbeekite is associated with gold, chrisstanleyite, oosterboschite (?), unnamed [Pd.sub.2][HgSe.sub.4] and cerussite.

General appearance: A single anhedral grain 200 x 200 [micro]m at Musonoi; at Hope's Nose, a single anhedral grain 25 [micro]m.

Physical, chemical and crystallographic properties: Luster: metallic. Diaphaneity: opaque. Color: black. Streak: black. Hardness: [VHN.sub.5] 550 kg/[mm.sub.2], Mohs ~ 5 1/2. Tenacity: brittle. Cleavage: none observed. Fracture: uneven. Density: could not be measured, 7.20 g/[cm.sub.3] (calc.), Crystallography: Monoclinic, C2/m, C2 or Cm, a 6.659, b 4.124, c 4.438 A, [beta] 92.76[degrees], V 121.7 [A.sub.3],Z 2, a:b:c = 1.6147:1:1.0761. Morphology: no forms were observed. Twinning: none mentioned X-ray powder diffraction data: 4.423 (30) (001), 3.496 (30) (110), 2.718 (100) (111), 1.955 (50) (310), 1.896 (50) (112). Optical data: In reflected light: nondescript gray, moderate anisotropism, nonbireflectant, nonpleochroic. [R.sub.1], [R.sub.2]; [R.sup.im.sub.1], [R.sup.im.sub.2]: (50.80, 52.30; 37.00, 38.40%) 470nm, (51.85, 52.90; 37.75, 38.30 %) 546nm, (52.20, 53.55; 38.50, 38.60 %) 589nm, (52.40, 54.00; 38.80, 39.60 %) 650nm. Chemical analytical data: Means of four sets of electron microprobe data: Cu 0.5, Pd 39.6, Se 58.8, Total 98.9 wt.%. Empirical formula: [([Pd.sub.0.99][Cu.sub.0.02]).B[SIGMA].sub.1.01][Se.sub.1.99]. Relationship to other species: It chemically is the Pd-analogue of sudovikovite (hexagonal [PtSe.sub.2]).

Name: For Dr. Theodore Verbeek (1927-1991) who was the first geoscientist to study the Musonoi palladium mineralization and who co-discovered the mineral with amateur mineralogist Ing. R. Coussement. Comments: IMA No. 2001-005.

ROBERTS, A. C., PAAR, W. H., COOPER, M. A., TOPA, D., CRIDDLE, A. J., and JEDWAB, J. (2002) Verbeekite, monoclinic [PdSe.sub.2], a new mineral from the Musonoi Cu-Co-Mn-U mine, near Kolwezi, Shaba Province, Democratic Republic of Congo. Mineralogical Magazine 66, 173-179.

Sincgartrellite

Triclinic

Pb[(Zn,Fe,CU).sub.2] [([AsO.sub.4]).sub.2] [([H.sub.2]O,OH)2]

Locality: The Tsumeb mine, Tsumeb, Namibia.

Occurrence: From material mined during 1975-1980 and purchased by G. Tremmel. Associated minerals are: chalcocite, wulfenite, duftite, "[beta]-duftite" (calcian conichalcite), "cuproadamite" and olivenite.

General appearance: Aggregates (up to 0.5 mm) made up of tabular crystals (<0.1 mm).

Physical, chemical and crystallographic properties: Luster: given as vitreous but the indices of refraction indicate adamantine. Diaphaneity: transparent to translucent. Color: green-yellow. Streak: yellow. Luminescence: nonfluorescent. Hardness: 4 1/2 . Tenacity: brittle. Cleavage: none observed. Fracture: not determined. Density: could not be measured, 5.37 g/[cm.sup.3] (calc.). Crystallography: Triclinic, P1, a 5.550, b 5.620, c 7.621 A, [alpha] 68.59[degrees], [beta] 69.17[degrees], [gamma] 69.51[degrees], V 200.1 [A.sub.3], Z 1, a:b:c=0.9875:1:1.3560. Morphology: {111}, tabular on {111}. Twinning: none mentioned. X-ray powder diffraction data: 4.731 (74)(011), 4.669 (86)(101), 3.283(89)(012), 3.252(91)(102), 3.185(66)(110), 2.999 (100)(111), 2.894 (74) (111), 2.880(70)(111), 2.535 (65)(102, 120, 012, 020) Krause et al. (1998). Optical data: Biaxial (-), [alpha] 1.91, [beta] 1.94 (calc.), [gamma] 1.97, 2V(meas.) 87[degrees], dispersion not determined; pleochroism weak, X = Z pale yellow, Y = yellow; orien tation not determined. Chemical analytical data: Means of sixteen sets of electron microprobe data: PbO 33.49, CaO 0.35, CuO 6.26 NiO <0.05, ZnO 11.40, [Al.sub.2][O.sub.3] 0.26, [Fe.sub.2][O.sub.3] 7.23, [As.sub.2][O.sub.5] 34.72, [SO.sub.3] 0.13, [H.sub.2]O (4.3), Total (98.62) wt.%. Empirical formula: [([Pb.sub.0.99][Ca.sub.0.04]).sub.[SIGMA]1.03] [([Zn.sub.0.92][Cu..sub.052][Fe.sub.0.60][Al.sub.0.03).sub.[SIGMA]2.0 7][[[([AsO.sub.4]).sub.1.99][(SO.sub.4).sub.0.01].sub.[SIGMA]2.00-] [[(OH).sub.0.82][[([H.sub.2]O).sub.1.16].sub.[SIGMA]1.98. Relationship to other species: It is a member of the tsumcorite group, specifically the Zn-dominant analogue of gartrellite.

Name: For the relationship with gartrellite.

Comments: IMA No. 1998-014.

EFFENBERGER, H., KRAUSE, W., BERNHARDT, H.-J., and MARTIN. M. (2000) On the symmetry of tsumcorite group minerals based on the new species rappoldite and zincgartrellite. Mineralogical Magazine 64, 1109-1126. KRAUSE, W., BELENDORFF, K., BERNHARDT, H.-J., McCAMMON, C., EFFENBERGER, H., and MIKENDA, W. (1998) Crystal chemistry of the tsumcorite-group minerals. New data on ferrilothar-meyerite, tsumcorite, thometzekite, mounanaite, helmutwinklerite, and a redefiniton of gartrellite. European Journal of Mineralogy 10, 179-206.
COPYRIGHT 2003 The Mineralogical, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2003 Gale, Cengage Learning. All rights reserved.

 
Article Details
Printer friendly Cite/link Email Feedback
Author:Mandarino, J.A.
Publication:The Mineralogical Record
Geographic Code:00WOR
Date:May 1, 2003
Words:7881
Previous Article:Peruvian minerals: an update.
Next Article:Carnegie Show 2002. (What's New in Minerals).
Topics:

Terms of use | Privacy policy | Copyright © 2018 Farlex, Inc. | Feedback | For webmasters