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Abstracts of new mineral descriptions.

INTRODUCTION

Shortly before I retired from the two jobs noted above, I approached Wendell Wilson to see if he would like to publish abstracts of new mineral descriptions in The Mineralogical Record. His reaction was positive and the abstracts which appear here are the first of many to follow. During the year after the manuscript of the Glossary of Mineral Species 1995 was sent to Wendell, about fifty descriptions of new minerals have been published in journals throughout the world and I will continue to send abstracts of these and other new mineral descriptions for publication here.

Most of the data included in these abstracts are taken directly from the descriptions. In some cases, particularly for those descriptions written in Russian and Chinese, I have supplemented the data (which I am unable to read) with data from the original IMA proposal. In some other cases, data which I have calculated from the data given in the descriptions vary from those calculated by the author(s). If the differences are significant, I have presented the results of my calculations. Where the differences are slight, I note that slightly different data are given in the original paper.

Crystal drawings appear in very few of the new descriptions published in the past year. I have reproduced these drawings with the use of Eric Dowty's SHAPE program. Small differences in my selection of distances for the various forms may result in slightly different proportions of the crystal forms in my drawings compared to those in the original drawings. However, every effort has been made to minimize this effect.

The format of the abstracts has evolved over the past few months and I welcome suggestions for any changes which will make the information more useful.

It is a pleasure to acknowledge the assistance of Mr. Andrew C. Roberts of the Geological Survey of Canada, who kindly supplies me with photocopies of descriptions from journals which are not readily available to me.

Abenakiite-(Ce) Hexagonal (trigonal)

[Na.sub.26][(Ce,REE).sub.6][(Si[O.sub.3]).sub.6][(P[O.sub.4]).sub .6][(C[O.sub.3].sub.6]([S.sup.4+][O.sub.2])O

Locality: Poudrette Quarry, Mont Saint-Hilaire. Rouville County, Quebec, Canada.

Occurrence: A single crystal (coated by an unidentified rhabdophane-group mineral) embedded in sodalite in a xenolith of sodalite syenite. Other associated minerals are: aegirine, eudialyte, mangan-neptunite, polylithionite, serandite and steenstrupine-(Ce).

General appearance: An ellipsoidal crystal approximately 2 x 1 mm.

Physical properties: Luster: vitreous. Diaphaneity: transparent. Color: pale brown. Streak: white. Luminescence: non-fluorescent. Hardness: [greater than] 4. Tenacity: brittle. Cleavage: {001} poor. Fracture: conchoidal. Density: 3.21 g/[cm.sup.3] (meas.), 3.27 g/[cm.sup.3] (calc.). Crystallography: Hexagonal (trigonal), [Mathematical Expression Omitted], a 16.018, c 19.761 [angstrom], V 4390.9 [[angstrom].sup.3], Z 3, c:a = 1.2337. Morphology: no forms given. Twinning: none noted. X-ray powder diffraction data: 11.414 (75), 8.036 (85), 6.554 (85), 5.066 (60), 4.646 (75), 3.773 (90), 3.591 (80), 3.150 (70), 2.674 (100). Optical data: Uniaxial (-), [Omega] 1.589, [Epsilon] 1.586, nonpleochroic. Chemical analytical data: Means of four sets of electron microprobe data: [Na.sub.2]O 25.32, SrO 0.12, [Ce.sub.2][O.sub.3] 15.31, [La.sub.2][O.sub.3] 5.94, [Nd.sub.2][O.sub.3] 7.78, [Pr.sub.2][O.sub.3] 2.02, [Sm.sub.2][O.sub.3] 0.74, Th[O.sub.2] 1.42, Si[O.sub.2] 13.30, [P.sub.2][O.sub.5] 14.11, S[O.sub.2] 2.28, C[O.sub.2] (8.91), Total 97.24 wt.%. Empirical formula: [Mathematical Expression Omitted]. Relationship to other species: none apparent. Name: For the Abenaki Indian tribe, which inhabited the area around Mont Saint-Hilaire. Comments: IMA No. 91-054.

MCDONALD, A. M., and CHAO, G. Y. (1994) Abenakiite-(Ce), a new silicophosphate carbonate mineral from Mont Saint-Hilaire, Quebec: description and structure determination. Canadian Mineralogist 32, 843-854.

Alumoklyuchevskite Monoclinic

[K.sub.3][Cu.sub.3]Al[O.sub.2][(S[O.sub.4]).sub.4]

Locality: The 2-nd cone of the Northern Breakthrough of the Main Tolbachik fracture eruption, Kamchatka, Russia.

Occurrence: As volcanic exhalations. Associated minerals: fedotovite, tenorite, langbeinite and lammerite.

General appearance: As long prismatic to needle-like crystals elongated parallel to [010] (up to 1 mm x [less than] 0.1 mm) in sheaf-like aggregates.

Physical properties: Luster: vitreous. Diaphaneity: transparent. Color: dark green, but the surface becomes coated with a white powder due to hydration after exposure to air in about a week. Streak: not given, but probably green. Luminescence: not given. Hardness: 2. Tenacity: not given. Cleavage: perfect parallel to h01. Fracture: not given. Density: 3.1 g/[cm.sup.3] (meas.), 2.95 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, 12, a 18.423, b 5.139, c 18.690 [angstrom], [Beta] 101.72 [degrees], V 1732 [[angstrom].sup.3], Z 4, a:b:c = 3.5849:1:3.6369. Morphology: forms not given. Twinning: not given. X-ray powder diffraction data: 9.15 (84), 9.04 (100), 7.20 (52), 3.781 (37), 3.757 (33), 2.786 (21). Optical data: Biaxial (+), [Alpha] 1.542, [Beta] 1.548, [Gamma] 1.641, 2V could not be measured, 2V(calc.) 30 [degrees]. Pleochroism: X light green, Y greyish green, Z dark green. Chemical analytical data: Means of 26 sets of electron microprobe data: [K.sub.2]O 18.68, CuO 31.19, [Al.sub.2][O.sub.3] 4.65, [Fe.sub.2][O.sub.3] 3.70, S[O.sub.3] 40.70, Total 98.92 wt.%. Empirical formula: [Mathematical Expression Omitted]. Relationship to other species: It is the aluminum dominant analog of klyuchevskite, [K.sub.3][Cu.sub.3][Fe.sup.3+][O.sub.2][(S[O.sub.4]).sub.4]. Name: The name is for the structural and chemical relationship to klyuchevskite. Comments: IMA No. 93-004. The description is unusual in that it is written in English, a most welcome development for this abstracter.

GORSKAYA, M. G., VERGASOVA, L. P., FILATOV, S. K., ROLICH, D. V., and ANANIEV, V. V. (1995) Alumoklyuchevskite, [K.sub.3][Cu.sub.3]Al[O.sub.2][(S[O.sub.4]).sub.4], a new oxysulphate of K, Cu and Al from volcanic exhalations, Kamchatka, Russia. Zapiski Vsesoyuznyi Mineralogicheskoe Obshchestva 124(1), 95-100.

Artroeite Triclinic

PbAl[F.sub.3][(OH).sub.2]

Locality: The Grand Reef mine, near Klondyke, Graham County, Arizona, U.S.A.

Occurrence: In a quartz-lined vug associated with anglesite, fluorite, galena and another new mineral with a formula, Pb[Ca.sub.2]Al[(F,OH).sub.9].

General appearance: Blades, up to 1 x 0.7 x 0.04 mm. Physical properties: Luster: vitreous. Diaphaneity: not given, but presumably transparent. Color: colorless. Streak: white. Luminescence: not given. Hardness: 2 1/2. Tenacity: brittle. Cleavage: {100} perfect, {010} good. Fracture: conchoidal. Density: 5.36 g/[cm.sup.3] (meas.), 5.42 g/[cm.sup.3] (calc.). Crystallography: Triclinic, [Mathematical Expression Omitted], a 6.270, b 6.821, c 5.057 [angstrom], [Alpha] 90.68 [degrees], [Beta] 107.69 [degrees], [Gamma] 104.46 [degrees], V 198.6 [[angstrom].sup.], Z 2. a:b:c = 0.9192:1:0.7414. Morphology: forms: {100}, {010}, {[Mathematical Expression Omitted]}, {011}, {[Mathematical Expression Omitted]}, {121}. Twinning: common by rotation on [010] with composition plane (100). X-ray powder diffraction data: 4.42 (100), 4.05 (35), 3.267 (35), 3.221 (40), 2.595 (70), 2.190 (65), 2.030 (50), 2.015 (40). Optical data: Biaxial (-), [Alpha] 1.629, [Beta] 1.682, [Gamma] 1.691, 2V(meas.) 41 [degrees], 2V(calc.) 44 [degrees]; dispersion r [greater than] v, strong. Chemical analytical data: Means often sets of electron microprobe data: PbO 67.5, [Al.sub.2][O.sub.3] 15.6, F 16.1, [H.sub.2]O 6.0, sum 105.2, less O = F 6.8, Total 98.4 wt.%. Empirical formula: [Pb.sub.1.00][Al.sub.1.01][F.sub.2.79][(OH).sub.2.19][O.sub.0.02]. Relationship to other species: Most closely related to the dimorphs acuminite and tikhonenkovite, SrAl[F.sub.4](OH) [multiplied by] [H.sub.2]O. Name: For Dr. Arthur (Art) Roe (1912-1993). Comments: IMA No. 93-031. The calculated density, calculated 2V and empirical formula given here are slightly different from those given in the description. The crystal drawing in the description is in a nonstandard orientation, so it has been changed to the normal orientation in this abstract.

KAMPE A. R., and FOORD, E. E. (1995) Artroeite, PbAl[F.sub.3][(OH).sub.2], a new mineral from the Grand Reef mine, Graham County, Arizona: Description and crystal structure. American Mineralogist 80, 179-183.

Crerarite Cubic

(Pt,Pb)[Bi.sub.3][(S,Se).sub.4-x] x [approximately] 0.7

Locality: Lac Sheen, near the village of Belleterre, Guillet Township, Abitibi-Temiscaminque region, Quebec, Canada (Lat. 47 [degrees] 30 [minutes] N, Long. 78 [degrees] 20 [minutes] W).

Occurrence: In amphibolite. Associated minerals are: chalcopyrite, pyrrhotite, pentlandite, sphalerite, galena, actinolite, chlorite and quartz. A single 10 [[micro]meter] grain of michenerite was found also.

General appearance: Small grains (mean diameter 12 mm, only two grains exceeded 50 [[micro]meter] in diameter).

Physical properties: Luster: metallic. Diaphaneity: opaque. Color: megascopic color not observed. Streak: black. Hardness: could not be determined, but the mineral is softer than chalcopyrite, i.e. less than 3 1/2. Tenacity: brittle. Cleavage: {100} perfect. Fracture: not observed. Density: could not be measured, 7.85 g/[cm.sup.3] (calc.). Crystallography: Cubic, Fm3m, a 5.86 [angstrom], V 201.2 [[angstrom].sup.3], Z 1. Morphology: no forms observed. Twinning: none observed. X-ray powder diffraction data: 3.37 (50), 2.94 (100), 2.07 (30), 1.766 (15), 1.687 (15), 1.472 (50), 1.347 (10), 1.311 (8), 1.197 (10). Optical data: In reflected light: white-grey; no anisotropism, bireflectance or pleochroism. R: (52.7 %) 460nm, (50.3 %) 540nm, (49.8 %) 580nm, (48.9 %) 660nm. Chemical analytical data: Means of 3 sets of electron microprobe data: Pd 0.03, Pt 10.34 (erroneously given as 10.14), Cu 0.09, Pb 13.85, Ni [less than] 0.05, Fe 0.08, Bi 65.26, Te 0.03, Se 0.86, S 10.55, Total 101.09 (given as 101.11) wt.%. Empirical formula: [([Pt.sub.0.50][Pb.sub.0.63][Bi.sub.2.94]).sub.[Sigma]4.07][([S.s ub.3.10][Se.sub.0.10]).sub.[Sigma]3.20]. Relationship to other species: None apparent. Name: For Prof. David Crerar (1945-1994) of Princeton University. Comments: IMA No. 94-003. A very small amount of the data given in this abstract were taken from the original IMA proposal.

COOK, N.J., WOOD, S. A., GEBERT, W., BERNHARDT, H-J, and MEDENBACH, O. (1994) Crerarite, a new Pt-Bi-Pb-S mineral from the Cu-Ni-PGE deposit at Lac Sheen, Abitibi-Temiscaminque, Quebec, Canada. Neues Jahrbuch fur Mineralogie, Monatshefte 1994, 567-575.

Dzharkenite Cubic

Fe[Se.sub.2]

Locality: In the Suluchekinskoye Se-U deposit, Dzharkenskaya depression, south eastern Kazakhstan.

Occurrence: In selenium ore associated with ferroselite and goethite.

General appearance: As small (10 to 100 [[micro]meter] in diameter, rarely up to 0.5 mm) octahedra and octahedra modified by dodecahedra.

Physical properties: Luster: metallic. Diaphaneity: opaque. Color: black. Streak: black. Hardness: 5, VH[N.sub.20] 338 kg/[mm.sup.2]. Tenacity: brittle. Cleavage: not known. Fracture: uneven. Density: 7.34 g/[cm.sup.3] (calc.). Crystallography: Cubic, Pa3, a 5.783, V 195.4 [[Angstrom].sup.3], Z 4. Morphology: forms: {111}, {110}. Twinning: not observed. X-ray powder diffraction data: 2.888 (50), 2.588 (100), 2.364 (80), 2.045 (40), 1.743 (50), 1.543 (60), 1.1131 (40). Optical data: In reflected light: pink-yellow; anisotropism, bireflectance and pleochroism absent. R: (41.7 %) 480nm, (42.6 %) 540nm, (45.1 %) 580nm, (50.2 %) 660nm. Chemical analytical data: Means of six sets of electron microprobe data: Co 0.01, Cu 0.04, Fe 26.70, Se 73.32, Total 100.07 wt. %. Empirical formula: [Fe.sub.1.02][Se.sub.1.98]. Relationship to other species: The selenium analog of pyrite. Name: For the locality. Comments: IMA No. 93-054.

YASHUNSKY, Yu. V., RYABEVA, E. G., ABRAMOV, M. V., and RASULOVA, S. D. (1995) Dzharkenite Fe[Se.sub.2] - the new mineral. Zapiski Vsesoyuznyi Mineralogicheskoe Obshchestva 124(1), 85-90.

Effenbergerite

Tetragonal

BaCu[Si.sub.4][O.sub.10]

Locality: Central-eastern orebody of the Wessels mine, Kala-hari Manganese Field, Northwestern Cape Province, Republic of South Africa.

Occurrence: In a matrix consisting primarily of braunite, sugilite and hausmannite, cut by pectolite veinlets (0.1-1 mm wide) in which the mineral occurs. Other associated minerals are: native copper, calcite, quartz, clinozoisite and two unidentified species.

General appearance: Subhedral plates up to 8 x 8 x 0.1 mm.

Physical properties: Luster: vitreous on cleavage plates, resinous on crystal faces and subvitreous on fracture surfaces. Diaphaneity: presumably transparent. Color: blue, similar to that of linarite. Streak: pale blue. Luminescence: non-fluorescent. Hardness: 4-5. Tenacity: brittle. Cleavage: {001} perfect and {110} very poor. Fracture: subconchoidal. Density: 3.57 g/[cm.sup.3] (meas.), 3.52 g/[cm.sup.3] (calc.). Crystallography: Tetragonal, P4/ncc, a 7.442, c 16.133 [Angstrom], V 893.50 [[Angstrom].sup.3], Z 4, c:a = 2.168. Morphology: forms: {100}, {110}, {102}, {001}. Twinning: none observed. X-ray powder diffraction data: 8.0624 (100), 4.0325 (39), 3.5443 (29), 3.1998 (44), 2.6892 (21), 2.3943 (41), 2.0169 (34), 1.9466 (22), 1.4802 (21). Optical data: Uniaxial (-), [Omega] 1.633, [Epsilon] 1.593, pleochroism strong: O intense blue, E pale blue to colorless. Chemical analytical data: Means of 27 sets of electron microprobe data: BaO 32.48, CuO 16.52, Si[O.sub.2] 50.76, [Al.sub.2][O.sub.3] 0.5, Total 100.26 wt. %. Empirical formula: [Ba.sub.1.00][Cu.sub.0.98][([Si.sub.3.98][Al.sub.0.05]).sub.[Sigm a].sub.4.03][O.sub.10.00]. Relationship to other species: Isostructural with cuprorivaite (CaCu[Si.sub.4][O.sub.10]), gillespite (BaFe[Si.sub.4][O.sub.10]) and some synthetic compounds. Name: For Dr. Herta S. Effenberger, mineralogist and crystallographer of the University of Vienna. Comments: IMA No. 93-036.

GIESTER, G., and RIECK, B. (1994) Effenbergerite, BaCu[[Si.sub.4][O.sub.10]], a new mineral from the Kalahari Manganese Field, South Africa: description and crystal structure. Mineralogical Magazine 58, 663-670.

Frankhawthorneite

Monoclinic

[Cu.sub.2][Te.sup.6+][O.sub.4][(OH).sub.2]

Locality: The Centennial Eureka mine, Juab County, Utah, U.S.A.

Occurrence: Isolated crystals or groups on drusy quartz. About 2 mg of the mineral is known to exist. Other associated minerals: mcalpineite, pyrite, hematite, acanthite, chrysocolla, connellite, enargite, hinsdalite, svanbergite and an undefined Cu-Zn-Te-mineral. The following CuTe secondary minerals also occur at the locality: cesbronite, xocomecatlite, quetzalcoatlite, dugganite, and five minerals under study.

General appearance: Prismatic to stubby bladed crystals up to 0.1 mm elongated on [001], with a length-to-width ratio of about 3:1.

Physical properties: Luster: given as vitreous, but the high index of refraction indicates that it should be adamantine. Diaphaneity: transparent. Color: medium leaf-green. Streak: less intense than the color. Luminescence: non-fluorescent. Hardness: estimated to be 3 to 4. Tenacity: brittle. Cleavage: not mentioned. Fracture: uneven. Density: could not be measured, 5.44 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, P[2.sub.1]/n, a 9.095, b 5.206, c 4.604 [Angstrom], [Beta] 98.69 [degrees], V 215.5 [[Angstrom].sup.3], Z 2, a:b:c = 1.7470:1:0.8844. Morphology: forms: {010}, {100}, {011}. Twinning: not observed. X-ray powder diffraction data: 4.506 (40), 4.337 (60), 3.838 (50), 2.891 (70), 2.598 (100), 1.834 (40), 1.713 (40), 1.500 (40). Optical data: In reflected light: pale grey, weakly anisotropic with somber brown rotation tints, weakly bireflectant but not pleochroic. The index of refraction calculated from the reflectance values at 590 nm is 2.00. Chemical analytical data: Means of five sets of electron microprobe data: CuO 45.20, Te[O.sub.3] 48.77, [H.sub.2]O (5.05) calculated, Total (99.02) wt. %. Empirical formula: Relationship to other species: none apparent. Name: For Prof. Frank C. Hawthorne, University of Manitoba. Comments: IMA No. 93-047. Note that the mineral is a tellurate.

ROBERTS, A. C., GRICE, J. D., CRIDDLE, A. J., JENSEN, M. C., HARRIS, D. C., and MOFFATT, E. A. (1995) Frankhawthorneite, [Cu.sub.2][Te.sup.6+][O.sub.4][(OH).sub.2], a new mineral species from the Centennial Eureka mine, Tintic district, Juab County, Utah. Canadian Mineralogist 33, 641-647 and GRICE, J. D., and ROBERTS, A. C. (1995) Frankhawthorneite, a unique HCP framework structure of a cupric tellurate. Canadian Mineralogist 33, 649-653.

Gaotaiite Cubic

[Ir.sub.3][Te.sub.8]

Locality: Near the village of Gaotai, about 200 km NNE of Beijing, People's Republic of China.

Occurrence: A constituent of placer deposits and crushed ores of a chromite deposit. Associated minerals: iridium, osmium, ferrian platinum, erlichmanite, iridisite, laurite, chromite, magnetite, gold and shuangfengite.

General appearance: As veinlets 0.05-0.02 mm wide by 0.31.0 mm long and as equant granular aggregates with individual grains 0.05-0.2 mm in diameter.

Physical properties: Luster: metallic. Diaphaneity: opaque. Color: steel-black. Streak: black. Hardness: 3, VH[N.sub.20] 117 kg/[mm.sup.2]. Tenacity: brittle. Cleavage: none. Fracture: not observed. Density: could not be measured, 9.97 g/[cm.sup.3] (calc.). Crystallography: Cubic, Pa3, a 6.413 [Angstrom], V 263.7 [[Angstrom].sup.3], Z 1. Twinning: none. X-ray powder diffraction data: 2.86 (70), 2.60 (60), 1.93 (100), 1.713 (60), 1.235 (80), 1.190 (60), 1.132 (90), 1.040 (80), 0.9780 (80). Optical data: In reflected light: bright white with bluish tint; no anisotropism, but sometimes weak with bluish or yellowish tint; bireflectance not observed; pleochroism, not observed. R: (46.6 %) 470nm, (46.3 %) 546nm, (46.3 %) 589nm, (45.6 %) 650nm. Chemical analytical data: Means of nine sets of electron microprobe data: Cu 0.2, Ir 35.6, Pt 0.1, Te 62.8, S 0.2, Total 98.9 wt. %. Empirical formula: [([Ir.sub.2.96][Cu.sub.0.05][Pt.sub.0.01]).sub.[Sigma]3.02][([Te. sub.7.88][S.sub.0.10]).sub.7.98]. Name: For the locality. Comments: IMA No. 93-017. The calculated density is given as 10.00 g/[cm.sup.3], but the value calculated from the unit cell and empirical formula is 9.97 g/[cm.sup.3].

YU ZUXIANG (1995) Gaotaiite - a new iridium telluride. Acta Mineralogica Sinica 15(1), 1-4.

Mayingite Cubic

IrBiTe

Locality: Near the village of Maying, about 230 km NNE of Beijing, People's Republic of China.

Occurrence: A constituent of placer concentrates and crushed ores of a chromite deposit. Associated minerals: osmium, ferrian platinum, iridisite, laurite, chromite, magnetite, gold, irarsite and shuangfengite.

General appearance: Massive aggregates 0.02-0.2 mm in diameter and as veinlets 0.1-0.2 mm wide by 1.0 mm long.

Physical properties: Luster: metallic. Diaphaneity: opaque. Color: steel-black. Streak: black. Hardness: 4, VH[N.sub.50] 178 kg/[mm.sup.2]. Tenacity: brittle. Cleavage: none. Fracture: none observed. Density: could not be measured, 12.72 g/[cm.sup.3] (calc.). Crystallography: Cubic, Pa3, a 6.502 [Angstrom], V 274.9 [[Angstrom].sup.3], Z 4. X-ray powder diffraction data: 2.89 (70), 1.955 (100), 1.735 (80), 1.250 (80), 1.207 (70), 1.148 (70), 1.054 (70), 0.9911 (70). Optical data: In reflected light: bright white with yellowish tint; no anisotropism, but some grains moderate with bluish or yellowish tint; no bireflectance or pleochroism. R: (49.5 %) 470nm, (50.8 %) 546nm, (51.6 %) 589nm, (52.2 %) 650nm. Chemical analytical data: Means of seven sets of electron microprobe data: Cu 0.1, Te 24.6, Ir 34.6, Pt 1.9, Bi 38.5, Total 99.7 wt. %. Empirical formula: [([Ir.sub.0.95][Pt.sub.0.05]).sub.[Sigma]1.00][Bi.sub.0.97][Cu.su b.0.01][Te.sub.1.02]. Name: For the locality. Comments: IMA No. 93-016. The empirical formula and calculated density given in the description are slightly different from those given here.

YU ZUXIANG (1995) Mayingite - a new iridium bismuthide-telluride. Acta Mineralogies Sinica 15(1), 5-8.

Mcalpineite Cubic

[Mathematical Expression Omitted]

Locality: McAlpine mine, Tuolumne County, California, U.S.A. (Lat. 37 [degrees] 45[minutes]58[seconds] N, Long. 120 [degrees] 15[minutes]9[seconds] W). Also from the Centennial Eureka mine, West Tintic district, Juab County, Utah, U.S.A. (Lat. 39 [degrees] 56[minutes]38[seconds] N, Long. 112 [degrees] 7[minutes]18[seconds] W). Most of the following data are for the McAlpine material. Data for the Utah mineral are also given in the paper.

Occurrence: On quartz associated with chromian muscovite. Metallic phases are: pyrite, acanthite, hessite, "electrum," altaite, silver, galena, pyrargyrite, sphalerite and owyheeite. Secondary nonmetallic minerals are: chlorargyrite, cholo-alite, keystoneite, mimetite, azurite, malachite, annabergite, calcite, goethite, hematite and numerous unidentified phases.

General appearance: Isolated 0.5-mm crusts on white quartz.

Physical properties: Luster: adamantine. Diaphaneity: transparent to translucent. Color: emerald-green. Streak: light green. Luminescence: non-fluorescent. Hardness: could not be determined. Tenacity: brittle. Cleavage: not observed. Fracture: uneven. Density: could not be measured, 6.63 g/[cm.sup.3] (calc.). Crystallography: Cubic, P space group unknown, a 9.555 [Angstrom], V 872.4 [[Angstrom].sup.3], Z 8. Morphology: no forms observed. X-ray powder diffraction data: 4.26 (40), 2.763 (100), 2.384 (70), 1.873 (40), 1.689 (80), 1.440 (60). Optical data: Isotropic, n 2.01 (from reflectance measurements). In reflected light, R values: (12.8 %) 470nm, (11.6 %) 546nm, (11.2 %) 589nm, (11.0 %) 650nm. Chemical analytical data: Means of four sets of electron microprobe data: CuO 50.84, NiO 0.17, PbO 4.68, Si[O.sub.2] 0.65, Te[O.sub.3] 39.05, [H.sub.2]O (4.61), Total (100.00) wt. %. [H.sub.2]O could not be determined but was confirmed by IR absorption spectroscopy; the value given is by difference from 100. Empirical formula: [Mathematical Expression Omitted]. Relationship to other species: It is unrelated to any of the other six copper tellurite or tellurate minerals (balyakinite, cesbronite, graemite, rajite, teineite and xocome-catlite). Name: For the mine at the type locality. Comments: IMA No. 92-025. The calculated value for [H.sub.2]O is given as 4.51 wt. % in the description, but this is a typographical error for 4.61; it has been corrected here. The calculated density is given as 6.65 g/[cm.sup.3] in the paper, but the empirical formula and unit cell give 6.63 g/[cm.sup.3].

ROBERTS, A. C., ERCIT, T. S., CRIDDLE, A. J., JONES, G. C., WILLIAMS, R. S., CURETON, F. F., and JENSEN, M. C. (1994) Mcalpineite, [Cu.sub.3]Te[O.sub.6][center dot]]H.sub.2]O, a new mineral from the McAlpine mine, Tuolumne County, California, and from the Centennial Eureka mine, Juab County, Utah. Mineralogical Magazine 58, 417-424.

Mccrillisite Tetragonal

NaCs(Be,Li)[Zr.sub.2][(P[O.sub.4]).sub.4][center dot]1-2[H.sub.2]O

Locality: Mount Mica granite pegmatite, South Paris, Oxford County, Maine, U.S.A.

Occurrence: Found in a large (1 x 1.2 x 1.6 m) piece of rock mined in 1977-1978, which was covered and then re-exposed in 1988. It occurs in open cavities up to several centimeters across and formed as a result of late-stage hydrothermal alteration of earlier-formed Zr-bearing minerals. Associated minerals: albite, quartz, manganoan almandine, muscovite, siderite, fluorapatite, elbaite, lepidolite, beryl, montebrasite, rhodochrosite, cassiterite, manganocolumbite, uraninite, lollingite, zircon, eosphorite, moraesite, ferroan roscherite and kosnarite.

General appearance: Bipyramidal crystals up to 1.2 mm in maximum dimension.

Physical properties: Luster: vitreous. Diaphaneity: transparent to translucent. Color: colorless. Streak: white. Luminescence: non-fluorescent. Hardness: 4 to 4 1/2. Tenacity: not given. Cleavage: none observed. Fracture: conchoidal. Density: 3.125 g/[cm.sup.3] (meas.), 3.30 g/[cm.sup.3] (calc.). Crystallography: Tetragonal, [14.sub.1]/amd, a 6.573, c 17.28 [Angstrom], V 746.6 [[Angstrom].sup.3], Z 2, c:a 2.6289. Morphology: forms: {111}, {001}. Twinning: not mentioned. X-ray powder diffraction data: 6.159 (90), 4.326 (80), 4.099 (40), 3.281 (80), 3.060 (100), 2.896 (30), 1.849 (30). Optical data: Uniaxial (+), [Omega] 1.634, [Epsilon] 1.645. Some grains anomalously biaxial with 2V up to 5 [degrees]. Chemical analytical data: Means of five sets of data from electron microprobe, laser-ablation and inductively coupled plasma-mass spectroscopy data: [Li.sub.2]O 0.6, [Na.sub.2]O 4.2, [K.sub.2]O 0.3, [Rb.sub.2]O [less than] 0.1, [Cs.sub.2]O 15.3, BeO 2.9, MgO 0.1, CaO [less than] 0.1, MnO [less than] 0.1, FeO [less than] 0.1, ZnO 0.5, SrO 0.2, [Al.sub.2][O.sub.3] [less than] 0.1, Si[O.sub.2] 0.1, Zr[O.sub.2] 31.6, Hf[O.sub.2] 2.5, [P.sub.2][O.sub.5] 38.3, [H.sub.2]O 3.0, F 0.5, sum 100.1, less O = F 0.21, Total 99.89 wt. %. The empirical formula is: [Na.sub.1.00][([Cs.sub.0.80][Li.sub.0.18][K.sub.0.05]).sub.[Sigma ]1.03][([Be.sub.0.86][Li.sub.0.12][Mg.sub.0.02]).sub.[Sigma]1.00] [([Zr.sub.1.90][Hf.sub.0.09][Zn.sub.0.05]).sub.[Sigma]2.04][([P.s ub.4.00][Si.sub.0.01]).sub.[Sigma]4.01][([O.sub.15.8][F.sub.02]). sub.[Sigma].1.03] Relationship to other species: It is the cesium-analog of gainesite, Na(Na)(Be,Li)[Zr.sub.2][(P[O.sub.4]).sub.4][center dot]1-2[H.sub.2]O. Name: In honor of the McCrillis family, particularly the late Dean McCrillis and his son, Philip McCrillis, of Oxford County, Maine, for their more than 90 years spent working the granitic pegmatites of Maine. Comments: IMA No. 91-023. The empirical formula and density calculated by the abstracter are very slightly different from those given by the authors.

FOORD, E. E., BROWNFIELD, M. E., LICHTE, F. E., DAVIS, A. M., and SUTLEY, S. J. (1994) Mccrillisite, NaCs(Be,Li)[Zr.sub.2][(P[O.sub.4]).sub.4][center dot]1-2[H.sub.2]O, a new mineral species from Mount Mica, Oxford County, Maine, and new data for gainesite. Canadian Mineralogist 32, 839-842.

Nierite

Hexagonal (Trigonal)

[Si.sub.3][N.sub.4]

Locality: In perchloric acid-resistant residues of three ordinary chondrite meteorites (Adrar 003 [LL3.2], Inman [L3.4] and Tieschitz [H3.6]) and one enstatite chondrite meteorite (Indarch [EH4]).

Occurrence: The grains in Indarch probably formed by exsolution of Si and N from kamacite, perryite and schreibersite during parent-body metamorphism. The origin of the mineral in the other meteorites is not known, but formation during exsolution is possible. Other minerals in the residues are: spinel, chromite, hibonite, rutlie, a Na-Cr silicate, diamond, silicon carbide and [Beta]-[Si.sub.3][N.sub.4], the hexagonal ([P6.sub.3]/m) polymorph of nierite ([Alpha]-[Si.sub.3][N.sub.4]).

General appearance: Very small ([approximately] 2 x 0.4 mm) lath-shaped grains.

Physical properties: Luster: probably adamantine. Diaphaneity: transparent. Color: colorless. Streak: probably white. Luminescence: unknown. Hardness: 9. Tenacity: probably brittle. Cleavage: unknown. Fracture: unknown. Density: 3.17-3.18 g/[cm.sup.3] (meas.), 3.11 g/[cm.sup.3] (calc.). Crystallography: Hexagonal (trigonal), P31c, a 7.74, c 5.61 [Angstrom], V 291.1 [[Angstrom].sub.3], Z 4, c:a 0.7248. Twinning: unknown. Selected area electron diffraction (SAED) data: 6.59, 2.90, 2.64, 2.17, 1.76, 1.45, 1.41. Optical data: Uniaxial (-), [Omega] 2.03, [Epsilon] 2.02. Chemical analytical data: Because of the small grains, ordinary electron microprobe analysis was not possible. The data given here were determined with an analytical STEM (scanning transmission electron microscope). Means of eight sets of data: N 43, Si 57, Total 100 wt. %. Empirical formula: [Si.sub.2.79][N.sub.4.21]. Name: For A. O. Nier (1912-1994), who was responsible for the now accepted measurement of the atmospheric N-isotopic composition. He was one of the founding fathers of mass spectrometry. Comments: IMA No. 94-032. Because of the very small size of the grains, many properties could not be determined. Many of the properties listed here are for the synthetic material.

LEE, M. R., RUSSELL, S.S., ARDEN, J. W, and PELLINGER, C.T. (1995) Nierite ([Si.sub.3][N.sub.4]), a new mineral from ordinary and enstatite chondrites. Meteoritics 30, 387-398.

Owensite Cubic

[(Ba,Pb).sub.6][(Cu,Fe,Ni).sub.25][S.sub.27]

Locality: The Wellgreen Cu-Ni-Pt-Pd deposit, Kluane District, Yukon Territory, Canada.

Occurrence: In pyrrhotite which occurs in peridotite and chilled gabbro-pegmatite gabbro. Other associated minerals: magnetite. chalcopyrite, pentlandite, pyrite, cobaltite-gersdorffite series, arsenopyrite, ullmannite, violarite, chromite, ilmenite, sphalerite, covellite, argentopentlandite, breithauptite, marcasite, nickeline, galena, rutile, barite, hessite, Au-Ag alloys, sperrylite, moncheite, sudburyite, testibiopalladite, kotulskite, mertieite-II, stibiopalladinite, geversite, melonite and four undefined minerals.

General appearance: Small anhedral grains 6 x 12 [[micro]meter] up to a maximum of 43 x 110 mm.

Physical properties: Luster: metallic. Diaphaneity: opaque. Color: observed only in polished section, so the megascopic color is unknown. Streak: black. Hardness: 3 1/2, VH[N.sub.10] 137 kg/[mm.sup.2]. Tenacity: unknown. Cleavage: unknown. Fracture: unknown. Density: could not be measured, 4.78 g/[cm.sup.3] (calc.). Crystallography: Cubic, Pm3m, a 10.349 [Angstrom], V 1108.4 [[Angstrom].sup.3], Z 1. X-ray powder diffraction data: 3.460 (40), 3.281 (40), 2.996 (90), 2.378 (90), 1.835 (100), 1.779 (40). Optical data: In reflected light: pale brownish grey: anisotropism, bireflectance and pleochroism not discernible. R: (22.0 %) 470nm, (24.9 %) 546nm, (26.2 %) 589nm, (27.55 %) 650nm. Chemical analytical data: Means of nine sets of electron microprobe data: Ba 23.04, Cu 25.33, Pb 3.58, Fe 20.24, Ni 0.25, S 27.11, Total 99.55 wt. %. Empirical formula: [([Ba.sub.5.42[Pb.sub.0.56]).sub.[Sigma]5.98][([Cu.sub.12.87][Fe. sub.11.70][Ni.sub.0.14]).sub.[Sigma]24.71][S.sub.27.31]. Relationship to other species: Closely related to djerfisherite. Name: For DeAlton R. Owens (1934- ), Canada Centre for Mineral and Energy Technology. Comments: IMA No. 93-061. This is the first barium sulfide mineral.

LAFLAMME, J. H. G., ROBERTS, A. C., CRIDDLE, A. J., and CABRI, L. J. (1995) Owensite, [(Ba,Pb).sub.6][(Cu,Fe,Ni).sub.25]-[S.sub.27], a new mineral species from the Wellgreen Cu-Ni-Pt-Pd deposit, Yukon. Canadian Mineralogist 33, 665-670 and SZYMANSKI, J. T. (1995) The crystal structure of owensite, [(Ba,Pb).sub.6][(Cu,Fe,Ni).sub.25][S.sub.27], a new member of the djerfisherite group. Canadian Mineralogist 33, 671-677.

Peterbaylissite

Orthorhombic

[Mathematical Expression Omitted]

Locality: A small prospect pit near the long-abandoned Clear Creek mercury mines, New Idria district, San Benito County, California, U.S.A. (Lat. 36 [degrees] 22[minutes]59[seconds] N, Long. 120 [degrees] 43[minutes]58[seconds] W).

Occurrence: On altered serpentinite consisting of quartz, chalcedony, opal, magnesite, goethite, ferroan magnesio-chromite, chlorite and dolomite. Associated mercury-bearing minerals are: cinnabar, metacinnabar and native mercury.

General appearance: As isolated or clustered subhedral to euhedral crystals (20 mm to 0.2 mm; average size about 0.1 mm long).

Physical properties: Luster: submetallic to adamantine. Diaphaneity: opaque. Color: black to very dark red-brown. Streak: dark brown-black. Luminescence: non-fluorescent. Hardness: less than 5. Tenacity: brittle. Cleavage: none observed. Fracture: irregular. Density: could not be measured, 7.14 g/[cm.sup.3] (calc.). Crystallography: Orthorhombic, Pcab (pseudotetragonal), a 11.130, b 11.139, c 10.725 [Angstrom], V 1330 [[Angstrom].sup.3], Z 8, a:b:c = 0.9992:1:0.9628. Morphology: no obvious forms were observed. Twinning: none observed. X-ray powder diffraction data: 4.84 (50), 2.969 (70), 2.786 (70), 2.648 (100), 2.419 (60), 1.580 (50). Optical data: Average n 2.10. In reflected light: grey with s slight blue tinge; anisotropism, weak in dull and dark grey and brown rotation tints; bireflectance, weak to moderate; nonpleochroic. [R.sub.min.] & [R.sub.max.]: (11.4, 12.15 %) 470nm, (10.95, 11.6 %) 546nm, (10.9, 11.5 %) 589nm, (10.7, 11.2 %) 650nm. Chemical analytical data: Means of two sets of electron microprobe data: [Hg.sub.2]O 87.4 wt. %. C[O.sub.2], and [H.sub.2]O could not be determined due to a dearth of material, but crystal structure determination confirmed the ideal formula, [Mathematical Expression Omitted], which requires [Hg.sub.2]O 87.54, C[O.sub.2] 6.16, [H.sub.2]O 6.30, Total 100.00 wt. %. Relationship to other species: none apparent. Name: For Dr. Peter Bayliss, Prof. Emeritus of Mineralogy, Department of Geology and Geophysics, University of Calgary, Calgary, Alberta, Canada. Comments: IMA No. 93-041.

ROBERTS, A. C., ERCIT, T. S., GROAT, L. A., CRIDDLE, A. J., ERD, R. C., and WILLIAMS, R. S. (1995) Peterbaylissite, [Mathematical Expression Omitted], a new mineral species from the Clear Creek claim, San Benito County, California. Canadian Mineralogist 33, 47-53.

Pingguite Orthorhombic

[Mathematical Expression Omitted]

Locality: At Yangjiava, Pinggu County, near Beijing, People's Republic of China.

Occurrence: In the oxidation zone of a small gold deposit. Associated minerals are: "limonite," malachite, pyromorphite, bismutite, gold, "electrum," quartz, calcite and scheelite.

General appearance: Rounded granular aggregates (0.0050.5 mm in diameter) of crystals (grain size 0.3-0.6 [[micro]meter]).

Physical properties: Luster: vitreous to adamantine. Diaphaneity: transparent. Color: yellowish-green. Streak: light yellow green. Luminescence: non-fluorescent. Hardness: VH[N.sub.50] = 510 kg/[mm.sup.2], Mohs 5-6. Tenacity: brittle. Cleavage: not observed. Fracture: not observed. Density: 8.44 g/[cm.sup.3] (meas.), 8.64 g/[cm.sup.3] (calc.). Crystallography: Orthorhombic, space group unknown, a 5.689, b 10.791, c 5.308 [Angstrom], V 325.8 [[Angstrom].sup.3], Z 1, a:b:c = 0.5272:1:0.4919. Morphology: crystals are columnar in outline. Twinning: not observed. X-ray powder diffraction data: 3.146 (100), 2.841 (80), 2.694 (20), 2.651 (9), 1.956 (10), 1.891 (8), 1.695 (20), 1.631 (10), 1.575 (8). Optical data: Biaxial, n [greater than] 2. R: (14.84 %) 470nm, (13.03 %) 546nm, (13.25 %) 589nm, (13.64 %) 650nm. Chemical analytical data: Means of 15 sets of electron microprobe data: [Bi.sub.2][O.sub.3] 79.56, Te[O.sub.2], 20.17, Total 99.73 wt. %. Empirical formula: [Bi.sub.5.80][Te.sub.2.15][O.sub.13.00]. Relationship to other species: It is a bismuth tellurite. Name: For the locality. Comments: IMA No. 93-019. Some of the data given in this abstract were taken from the original IMA proposal.

SUN ZHIFU, LUO KEDING, TAN FALAN, and ZHANG JINGYI (1994) Pingguite - a new bismuth tellurite mineral. Acta Mineralogica Sinica 14(4), 315-321.

Schwertmannite Tetragonal

[Fe.sub.16][O.sub.16][(OH).sub.12][(S[O.sub.4]).sub.2]

Locality: Pyhasalmi sulphide mine, Province of Oulu, Finland (Lat. 63 [degrees] 39.6[minutes] N, Long. 26 [degrees] 2[minutes] E). It has been identified from over 40 different localities in Europe, North America and Australia.

Occurrence: As a secondary precipitate forming crusts on material inundated by acidic (pH 3.2) drainage water. Other minerals at the type locality are pyrite, sphalerite, chalcopyrite, pyrrhotite, galena and arsenopyrite. Associated minerals at other localities may include jarosite, natrojarosite, goethite and ferrihydrite.

General appearance: Very fine-grained, ochreous crusts.

Physical properties: Luster: earthy. Diaphaneity: opaque. Color: brownish yellow. Streak: not given, but probably close to the color. Luminescence: non-fluorescent. Hardness: could not be determined. Tenacity: not given. Cleavage: not given. Fracture: not given. Density: could not be measured; 3.77 to 3.99 g/[cm.sup.3] (calc.). Crystallography: Tetragonal, probably P4/m, a 10.66, c 6.04 [Angstrom], V 686 [[Angstrom].sup.3], Z 1. c:a = 0.5660. Morphology: aggregates of very fine needles; forms could not be identified. X-ray powder diffraction data: 4.86 (37), 3.39 (46), 2.55 (100), 2.28 (23), 1.66 (21), 1.51 (24). Optical data: could not be determined. Chemical analytical data: Wet chemical analysis gave: [Fe.sub.2][O.sub.3] 62.6, S[O.sub.3] 12.7, C[O.sub.2] 1.5, [H.sub.2]O-10.2, [H.sub.2][O.sup.+] 12.9, Total 99.9 wt. %. The most general simplified formula is given as: [Fe.sub.16][O.sub.16][(OH).sub.y][(S[O.sub.4]).sub.z][center dot]n[H.sub.2]O, where 16 - y = 2z and z varies between 2.0 and 3.5; the value of n is not given. Relationship to other species: probably related to akaganeite and hollandite. Name: In honor of Udo Schwertmann (1927-), Professor of soil science at the University of Munich. Comments: IMA No. 90006.

BIGHAM, J. M., CARLSON, L., and MURAD, E. (1994) Schwertmannite, a new iron oxyhydroxysulphate from Pyhasalmi, Finland, and other localities. Mineralogical Magazine 58, 641-648.

Selwynite Tetragonal

NaK(Be,Al)[Zr.sub.2][(P[O.sub.4]).sub.4][center dot]2[H.sub.2]O

Locality: A granite quarry near Wycheproof, northwestern Victoria, Australia (Lat. 36 [degrees] 05[minutes] S, Long. 143 [degrees] 14[minutes] E).

Occurrence: In pegmatite cavities. The pegmatite consists mainly of quartz, orthoclase, albite, muscovite and schorl. Associated minerals in the cavities are: wardite, eosphorite, cyrilovite, a kidwellite-like mineral, rockbridgeite, leucophosphite, saleeite and montmorillonite. Other zir-conium-bearing species at the locality are: kosnarite and wycheproofite, NaAlZr[(P[O.sub.4]).sub.2][(OH).sub.2]?[H.sub.2]O.

General appearance: Irregular fillings of cavities. These consist of intergrowths of indistinct radiating crystals.

Physical properties: Luster: vitreous. Diaphaneity: transparent. Color: deep purplish blue. Streak: pale lavender. Luminescence: non-fluorescent. Hardness: 4. Tenacity: not given. Cleavage: none observed. Fracture: semiconchoidal. Density: 2.94 g/[cm.sup.3] (meas.), 3.08 g/[cm.sup.3] (calc.). Crystallography: Tetragonal, [I4.sub.1]/amd. a 6.570, c 17.142 [Angstrom], V 739.9 [[Angstrom].sub.3], Z 2, c:a = 2.6091. Morphology: no forms observed. Twinning: not mentioned. X-ray powder diffraction data: 6.161 (100), 4.291 (25), 3.286 (50), 3.039 (30), 2.895 (20), 2.609 (5), 2.431 (5), 2.169 (5), 1.847 (5), 1.828 (5). Optical data: Uniaxial (+), [Omega] 1.624, [Epsilon] 1.636. Pleochroism distinct: O medium bluish lavender, E very pale bluish lavender. Chemical analytical data; Means of 9 sets of electron microprobe data ([H.sub.2]O by CHN analyzer, Rb and Be by ICP): [Na.sub.2]O 4.77, [K.sub.2]O 6.26, [Rb.sub.2]O 0.20, [Cs.sub.2]O 0.70, BeO 1.43, MgO 0.15, CaO 0.98, MnO 0.99, FeO 0.49, SrO 0.16, BaO 0.16, [Al.sub.2][O.sub.3] 1.04, [Ce.sub.2][O.sub.3] 0.03, Si[O.sub.2] 0.49, [P.sub.2][O.sub.5] 40.90, Zr[O.sub.2], 33.76, Hf[O.sub.2] 1.17, [H.sub.2]O 5.4, F 0.37, sum 99.45, less O = F 0.16, Total 99.29 wt. %. Empirical formula: [Na.sub.1.00][([K.sub.0.92][Na.sub.0.06][Cs.sub.0.03][Rb.sub.0.02 ]).sub.[Sigma]0.03]-[([Be.sub.0.40][Al.sub.0.14][Ca.sub.0.12][Mn. sub.0.10][Fe.sub.0.05][Mg.sub.0.03][Sr.sub.0.01][Ba.sub.0.01]).su b.[Sigma]0.86][([Zr.sub.1.89][Hf.sub.0.04]).sub.[Sigma]1.93][([P. sub.3.98][Si.sub.0.06]).sub.[Sigma]4.04]-[O.sub.15.80][F.sub.0.13 ][center dot]2.17[H.sub.2]O. Relationship to other species: It is the potassium analog of gainesite, NaNa(Be,Li)[Zr.sub.2][(P[O.sub.4]).sub.4][center dot]1-2[H.sub.2]O and mccrillisite, NaCs(Be,Li)[Zr.sub.2][(P[O.sub.4]).sub.4][center dot]1-2[H.sub.2]O. Name: For A. R. C. Selwyn (1824-1902), founding director of the Geological Survey of Victoria, Australia. Comments: IMA No. 93-037.

BIRCH, W. D., PRING, A., and FOORD, E. E. (1995) Selwynite, NaK(Be,Al)[Zr.sub.2][(P[O.sub.4]).sub.4][center dot]2[H.sub.2]O, a new gainesite-like mineral from Wycheproof, Victoria, Australia. Canadian Mineralogist 33, 55-58.

Shuangfengite Hexagonal (trigonal)

Ir[Te.sub.2]

Locality: Near the village of Shuangfeng about 190 km NNE of Beijing, People's Republic of China.

Occurrence: Placer concentrates and crushed ores of a chromite deposit. Associated minerals are: iridium, osmium, ferrian platinum, erlichmanite, iridisite, chromite, magnetite, ilmenite, gold, irarsite and gaotaiite.

General appearance: As massive aggregates 0.5-0.2 mm in diameter and as veinlets 0.05-0.10 mm wide and 0.5-1.0 mm long.

Physical properties: Luster: metallic. Diaphaneity: opaque. Color: black. Streak: black. Hardness: VH[N.sub.20] 108, Mohs 3. Tenacity: brittle. Cleavage: {001} perfect. Fracture: none observed. Density: could not be measured, 10.14 g/[cm.sup.3] (calc.). Crystallography: Hexagonal (trigonal), P3m1, a 3.933, c 5.390 [Angstrom], V 72.2 [[Angstrom].sup.3], Z 1, c:a = 1.3705. Morphology: no forms observed. Twinning: none observed. X-ray powder diffraction data: 2.85 (100), 2.10 (80), 1.95 (60), 1.580 (70), 1.435 (50), 1.250 (50), 1.160 (60), 1.0276 (50). Optical data: In reflected light: bright yellowish white with bluish tint; anisotropism, moderate with bluish or yellowish tint; bireflectance and pleochroism not observed. [R.sub.E], & [R.sub.O]: (45.5, 41.8 %) 470nm, (45.4, 41.8 %) 550nm, (45.5, 42.2 %) 590nm, (46.0, 42.9 %) 650nm. Chemical analytical data: Means of 9 sets of electron microprobe data: Ir 40.3, Pt 1.2, Os 0.1, Rh 0.0, Cu 0.2, Pb 0.0, Ni 0.0, Fe 0.0, Sb 0.0, As 0.0, Bi 0.4, Te 56.7, S 0.3, Total 99.2 wt. %. Empirical formula: [([Ir.sub.0.93][Pt.sub.0.03][Cu.sub.0.01][Bi.sub.0.1]).sub.[Sigma ]0.98][(Te.sub.1.97][S.sub.0.04]).sub.2.01]. Relationship to other species: It is isostructural with synthetic Pt[Te.sub.2]. Name: For the locality. Comments: IMA No. 93-018. Some of the data given in this abstract were taken from the original IMA proposal.

YU ZUXIANG (1994) Shuangfengite - a new iridium bitelluride. Acta Mineralogica Sinica 14(4), 322-326.

Vanadomalayaite Monoclinic

CaVOSi[O.sub.4]

Locality: Gambatesa mine, near Reppia,Val Gravegila, northern Apennines, Italy.

Occurrence: Associated with calcite, quartz and haradaite in a small vein cutting ophiolitic metacherts.

General appearance: As subhedral, isolated crystals up to 0.4 mm.

Physical properties: Luster: adamantine. Diaphaneity: transparent. Color: deep red. Streak: red. Luminescence: non-fluorescent. Hardness: not given. Tenacity: not given, but probably brittle. Cleavage: {110}, good. Fracture: not given. Density: 3.60g/[cm.sup.3] (meas.), 3.61 g/[cm.sup.3] (calc.). Crystallography: Monoclinic, C2/c, a 6.526, b 8.691, c 7.032 [Angstrom], [Beta] 113.88 [degrees], V 364.7 [[Angstrom].sup.3], Z 4, a:b:c 0.7509:1:0.8091. No forms were reported. No twinning was observed. X-ray powder diffraction data: 4.90 (W), 3.22 (VS), 2.97 (M), 2.59 (S), 2.271 (W), 2.057 (W), 1.702 (W), 1.641 (W), 1.557 (W), 1.493 (w), 1.415 (W). Optical data: Biaxial (sign not given), [Alpha] about 1.95, [Beta] unknown, [Gamma] 2.105, 2V unknown, dispersion strong. pleochroic: X [approximately equal to] Y = brownish red-orange, Z = deep greenish-blue. Chemical analytical data: Means of twenty-five sets of electron microprobe data: CaO 28.33, MnO 0.07, [Al.sub.2][O.sub.3] 0.27, [Fe.sub.2][O.sub.3] 0.46, Si[O.sub.2] 30.47, Ti[O.sub.2] 10.51, V[O.sub.2] 29.86, Total 99.97 wt. %. Empirical formula: [Ca.sub.1.00][([V.sub.0.72][Ti.sub.0.26][Al.sub.0.01][Fe.sub.0.01 ]).sub.[Sigma]1.00]O[Si.sub.1.01][O.sub.4.00]. Relationship to other species: the vanadium analogue of malayaite and titanite. Name: To show the chemical relationship to malayaite. Comments: IMA No. 93-032.

BASSO, R., LUCCHETTI, G., ZEFIRO, L, and PALEN-ZONA, A. (1994) Vanadomalayaite, CaVOSi[O.sub.4], a new mineral vanadium analog of titanite and malayaite. Neues Jahrbuch fur Mineralogie, Monatshefte 1994, 489-498.
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Author:Mandarino, J.A.
Publication:The Mineralogical Record
Date:Mar 1, 1996
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