American Mineralogist, Volume 83, pages 1117±1121, 1998 NEW MINERAL NAMES* JOHN L. JAMBOR,1 VLADIMIR A. KOVALENKER,2 AND ANDREW C. ROBERTS3 1Department of Earth Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada 2IGREM RAN, Russian Academy of Sciences, Moscow 10917, Staromonetnii 35, Russia 3Geological Survey of Canada, 601 Booth Street, Ottawa K1A 0E8, Canada Niobocarbide* Electron microprobe analysis gave PbO 39.02, CaO M.I. Novgorodova, M.E. Generalov, N.V. Trubkin (1997) 0.20, Fe2O3 14.14, CuO 14.41, P2O5 22.05, As2O5 4.58, The new TaC-NbC isomorphic row and niobocarbideÐ H2O (calc.) 4.83, sum 99.23 wt%, corresponding to a new mineral from platinum placers of the Urals. Zap- Pb0.99Ca0.02Cu1.02Fe1.00(PO4)1. 75(AsO4)0.23(OH)1.12(H2O)0.96. iski Vseross. Mineral. Obshch., 126(1), 76±95 (in Rus- Absorption bands attributable to OH/H2O are present in sian, English abs.). the IR spectrum. The mineral occurs as bright green ag- gregates, up to 0.2 mm across, in which intergrown tab- The mineral occurs as cubic and octahedral crystals ular individuals are and rounded grains, to 0.2 mm, in Pt placers in the Ni- ,50 mm long. Yellow streak, vitreous zhnetagilsky district, middle Urals, Russia. Bronze to to adamantine luster, transparent, no cleavage, non¯u- orescent, H 5 4 , D 5 5.05 g/cm3 for Z 5 1. Optically straw-yellow color, opaque, bright metallic luster, no ½ calc biaxial positive, a51.90(2), b 5 1.93, g52.00(2), cleavage, VHN 5 1870 (1850±1900), D 5 9.3 g/cm3 calc 50 calc 2V 5 70(5)8, no distinct pleochroism or dispersion. The for Z 5 4. Light cream to pink cream color in re¯ected z X-ray powder pattern (diffractometer, CuKa radiation) is light, isotropic. Re¯ectance percentages in air (Si standard) 1 similar to that of gartrellite, and indexing by analogy gave are given in 20 nm steps from 400 to 700 nm; represen- a triclinic cell, space group P1, a 5.320(2), b 5.528(2), tative values are 40.0 (460), 42.4 (480), 47.9 (540), 49.0 5 5 c 7.434(3) AÊ , 67.61(3), 69.68(5), (560), 51.0 (580), 54.0 (600), 55.3 (640), and 55.9 (660). 5 a5 b5 g5 70.65(4) . Strongest lines of the pattern are 4.720(67,011), Electron microprobe analysis of 21 grains gave an aver- 8 4.502(61,101), 4.360(100,111), 3.250(70,012), 2.884(89,111 ) age and range of Ta 47.50 (27.55±57.10), Nb 42.50 and 2.868(69,111). (31.66±60.82), W 2.49 (0.48±4.55), C 8.58 (7.83±9.80) calc The mineral is associated with hentschelite, pyromor- wt%, corresponding to Nb Ta W C and Nb Ta C 0.80 0.14 0.01 0.52 0.48 phite, malachite, and cuprite that occur as oxidation prod- for the range. Electron diffraction patterns indicated cubic ucts on samples of silici®ed barite veins at Hohenstein symmetry, space group Fm3m, a 5 4.45 AÊ . Strongest lines of the powder pattern (114 mm camera, Fe radia- (type locality) and Odenwald, Germany. Type material is tion) are 2.56(110,111), 2.22(90,200), 1.574(80,220), in the Institut fuÈr Mineralogie, Ruhr-UniversitaÈt Bochum, 1.343(80,311), 1.289(70,222), and 1.115(30,400). Germany. The mineral is part of the material collected by P. Wal- Discussion. Although stated to be the phosphate analog of gartrellite, and named accordingly, the formula of ther at the turn of the 20th century and housed at the Fersman Mineralogical Museum, Moscow. The new phosphogartrellite is not strictly analogous to that of gar- name alludes to the composition, which is the Nb analog trellite. J.L.J. of ``tantalcarbide''. Discussion. The status of ``tantalcarbide'' as a valid species has been uncertain, but the authors list numerous Rambergite* new analyses that indicate solid solution from M.E. BoÈttcher, H. Huckriede (1997) First occurrence and stable isotope composition of authigenic g-MnS in the Ta 0.95Nb0.05CtoTa0.51Nb0.49C; thus, there seems to be a complete series from ``tantalcarbide'' to niobocarbide. central Gotland Deep (Baltic Sea). Marine Geol., 137, V.A.K. 201±205. M.P. Kalinowski (1996) Rambergite, a new polymorph of MnS with hexagonal structure. Geol. FoÈren. FoÈrh., 118, A53±A54. Phosphogartrellite* W. Krause, K. Belendorff, H.-J. Bernhardt, K. Petitjean The mineral, which coexists with globules of rhodo- chrosite in anoxic, laminated, Baltic Sea sediments rich (1998) Phosphogartrellite, PbCuFe(PO4)2(OH)´H2O, a new member of the tsumcorite group. Neues Jahrb. in organic matter, occurs as idiomorphic hexagonal crys- Mineral. Mon., 111±118. tals about 200 mm long and 150 mm wide; sulfur isotopic analysis indicates derivation of the S by reduction of sul- * Before publication, minerals marked with an asterisk were fate. Also occurs in cavities in amphibole skarn in the approved by the Commission on New Minerals and Mineral Garpenberg area, Dalarna, Sweden, associated with ¯uo- Names, International Mineralogical Association. rite, apophyllite, calcite, barite, sphalerite, galena, pyrite, 0003±004X/98/0910±1117$05.00 1117 1118 JAMBOR ET AL.: NEW MINERAL NAMES samsonite, pyrargyrite, pyrrhotite, and freibergite. Crys- The mineral occurs as irregular grains, to 180 mm, in tals in skarn are up to 1.5 mm long, showing {101 0} and clausthalite in a dolomite-roscoelite veinlet at the Sred- {0001}, with rare, small {101 1}. Dark brown to black naya Padma U-V deposit, Karelia, Russia. Electron mi- color, resinous luster, brown streak, brittle, uneven frac- croprobe analysis (mean of 12 listed) gave Pt 53.38, Pd ture, {112 0} and {0001} cleavages observed in polished 2.52, Se 43.70, sum 99.60 wt%, corresponding to section, H 5 4. Electron-microprobe analyses (not given) (Pt0.99Pd0.08)S1.07Se2.00, ideally PtSe2. Opaque, metallic lus- correspond to (Mn0.950Fe0.030Sb0.004Zn0.002Ag0.002)S0.988S1.000. ter, white with a yellowish tint, VHN20 5 87 (81±93). Steel gray in re¯ected light, low re¯ectance, brown-red White in re¯ected light; strong bire¯ectance, with ple- internal re¯ection. Hexagonal symmetry, space group ochroism light yellow at Rmax and light lilac at Rmin. Ê P63mc, a 5 3.975(5), c 5 6.433(6) A. The powder pattern Strongly anisotropic, with polarization colors of rose-yel- has lines at 3.445(89), 3.217(72), 3.036(66), 2.350(32), low to dark gray-lilac. Re¯ectance percentages (Si stan- 1.988(82), 1.820(100), 1.721(18), 1.691(63), and 1.66(17). dard, air) are given in 20 nm steps from 400 to 700 nm; The name is for Hans Ramberg, former professor of min- representative Rmax and Rmin values are 48.4, 35.1 (470), eralogy and petrology at Uppsala University. 48.3, 35.1 (546), 49.1 35.3 (589), and 50.8, 36.5 (650). Discussion. A complete description has not been pub- Indexing of the X-ray powder pattern, by analogy with that lished. Additional data on optical properties are given in of synthetic PtSe2, gave trigonal symmetry, space group Ê 3 the abstract for mineral IMA No. 95-028. J.L.J. Pm3 1, a 5 3.730(7), c 5 5.024(17) A, Dcalc 5 9.7 g/cm for Z 5 1. Strongest lines (57 mm camera, FeKa radia- tion) are 5.04(30,001), 2.715(100,101), 1.983(50,102), Saddlebackite* 1.859(50,110), 1.747(30,111), and 1.360(40,202). R.M. Clarke (1997) Saddlebackite, Pb2Bi2Te 2S3, a new The mineral is associated with clausthalite, guanajuatite, mineral species from the Boddington gold deposit, insizwaite, padmaite, bohdanowiczite, sobolevskite, Western Australia. Austral. J. Mineral., 3(2), 119±124. froodite, polarite, bismuth, gold, roscoelite, dolomite, Electron microprobe analysis gave Pb 35.10, Bi 34.40, quartz, and unnamed PtBiSe and PtCoCu(Se,S)4. The new Te 23.12, S 7.94, sum 100.56 wt%, corresponding to name is for Russian petrologist N.G. Sudovikov (1903± 1966). Type material is in the Mining Museum of the Pb2.00Bi1.94Te 2.14S2.92. Occurs as anhedral grains up to 2 mm; gray color, black streak, metallic luster, platy to ¯aky habit, Saint Petersburg Mining Institute, Russia. V.A.K. perfect {0001} cleavage, uneven fracture, sectile, inelas- 3 tic but ¯exible, VHN20 5 42, Dcalc 5 7.61 g/cm for Z 5 2. Opaque in re¯ected light, grayish white color, weakly bi- Velikite* re¯ectant, nonpleochroic, faintly anisotropic from gray to V.S. Gruzdev, V.Y. Volgin, E.M. Spiridonov, T.L. Evstig- yellowish-brownish gray. Re¯ectance percentages for R neeva, Y.K. Kabalov, V.I. Sorokin, E.G. Osadchyi, T.N. o Chvileva, N.M. Chernizova (1997) Velikite Cu HgSnS and R (WTiC standard, in air) are 40.4, 39.3 (470 nm), 2 4 E (mercurian member of the stannite group)Ða new min- 42.1, 40.8 (546), 41.3, 40.8 (589), and 41.9, 40.9 (650). eral. Zapiski Vseross. Mineral. Obshch., 126(4), 71±75 Convergent-beam electron diffraction indicated hexagonal (in Russian). symmetry; cell dimensions deduced by indexing of the X-ray powder pattern (114 mm Debye±Scherrer, CoKa The mineral occurs as small grains and tetragonal-sca- radiation) are a 5 4.230(4), c 5 33.43(2) AÊ .