American Mineralogist, Volume 82, pages 1038±1041, 1997 NEW MINERAL NAMES* JOHN L. JAMBOR,1 NIKOLAI N. PERTSEV,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, Ontario K1A 0G1, Canada Afanasyevaite, cheso®ite, igumnovite, rhythmite 50.1±51.2 (R2). Indexing of the X-ray powder pattern indi- B.V. Chesnokov (1995) High-temperature chlorosilicate cated trigonal symmetry, space group P3m1, a 5 4.249(2), in burned-out mine spoil heaps in the Chelyabinsk coal c 5 62.82(5) AÊ . The X-ray powder pattern (27 lines, dif- basin. Doklady Akad. Nauk, 343(1), 94±95 [English fractometer, CoKa1 radiation) has strongest lines at translation in Trans. Russ. Acad. Sci., Earth Sci. Sect., 4.50(46,00.14), 3.09(100,01.11), 2.255(38,10.22), and 345(8), 104±106, 1996]. 2.126(25,110). The structure has 33 layers per cell. Electron microprobe analyses (not given, except for Cl The mineral occurs among voids in aggregates of an- and F) are reported to correspond to the following named dradite, calcite, chlorite, and stilpnomelane in altered magnetite-andradite skarn at the Tyrny'auz W-Mo depos- compounds. Afanasyevaite is Ca8[Si2O7]2´Cl2O, granular habit, pseudocubic; electron microprobe analysis gave it, Kabardino-Balkaria Republic, Russian Federation. Baksanite contains inclusions of native gold and, rarely, 6.19 Cl (calc., 9.35 wt%), 0.85 F, and 0.64 SO3 wt%. Cheso®ite is Ca [Si O ] ´CaCl , acicular habit, monoclin- intergrowths of ingodite and joseite-A; all are separated 9 2 7 3 2 from the host aggregates by a thin lining of bismuthinite. ic, Cl 7.33, F 0.04 wt%. Igumnovite is Ca3Al2[SiO4]2Cl4, cubic, Cl 28.25, F 0.13 wt%. Rhythmite is The new name refers to the type locality, the Baksan Riv- er valley. Type material is in the Fersman Mineralogical Ca4[SiO4]2´3CaCl2, orthorhombic, Cl 31.06, F 0.22 wt%. The compounds were formed by the reaction of mudstone Museum, Moscow, Russia. N.N.P. and dolomite, and other carbonate rocks, in burned-out mine wastes from the Kopeysk coal mines in the Chelya- Fougerite binsk basin, southern Urals, Russia. Discussion. Additional data and the derivation of the F. Trolard, M. Abdelmoula, G. BourrieÂ, B. Humbert, J.-M.R. GeÂnin (1996) Evidence of the occurrence of a names are not given. The compounds no longer qualify ``green rusts'' component in hydromorphic soils. Pro- as minerals. J.L.J. posed existence of a new mineral ``fougerite.'' C. Ren- du Acad. Sci. Paris, Ser. IIa, 323, 1015±1022 (in French, English abs.). Baksanite* F. Trolard, J.-M.R. GeÂnin, M. Abdelmoula, G. BourrieÂ, B. I.V. Pekov, E.N. Zav'yalov, S.V. Fedyushchenko, D.K. Humbert, A. Herbillon (1997) Identi®cation of a green Shcherbachev, Yu.S. Borodayev, G.D. Dorokhova rust mineral in a reductomorphic soil by MoÈssbauer and Raman spectroscopies. Geochim. Cosmochim. (1996) Baksanite, Bi6(Te2S3), a new mineral from Tyr- ny'auz (northern Caucasus). Doklady Akad. Sci., Acta, 61, 1107±1111. 347(6), 787±791 (in Russian). So-called green rusts are well known synthetically. It has long been assumed that the same, mixed-valence Electron microprobe analysis of several grains that were Fe21-Fe31 compound is responsible for the blue-green col- checked by X-ray powder patterns gave a mean of Bi 76.40, ors in sediments and hydromorphic soils that rapidly be- Pb 2.15, Sb 0.12, Te 14.33, Se 0.00, S 6.64, sum 99.64 come ochreous upon exposure to air as a consequence of wt%, corresponding to (Bi Pb Sb ) (Te S ). The 5.78 0.16 0.02 S5.96 1.77 3.27 oxidation of Fe21 and transformation of the blue-green composition is uniform. The mineral occurs as spherical to phase to goethite and lepidocrocite. MoÈssbauer and Ra- droplet-like single grains and aggregates up to 13 mm man spectra, and dissolution by citrate-bicarbonate re- across; steel-gray color, metallic luster, black streak, perfect agent, showed that the natural and synthetic compounds basal cleavage, H 5 11 ±2, VHN 5 62 (mean for aniso- /2 5 are identical; previous studies had indicated the general tropic sections), D 5 8.1(1), D 5 8.07 g/cm3 for Z 5 meas calc formula of the compound to be [Fe21 Fe31 (OH) ]x1´ 3. Bright white in re¯ected light, weak bire¯ectance, dis- 1 2 xx 2 [xA2z´mHO]x2, where Fe is in Fe(OH) brucite-like layers tinctly anisotropic in yellowish gray tints; re¯ectance per- /z /z2 2 that alternate with Az2 anions and H O molecules. The centages, given in 20 nm steps from 400 to 700 nm, range 2 formula can be simpli®ed as Fe21Fe31(OH) . The new from 46.3±48.5 (R , 400 and 700 nm, respectively) and 5 1 name fougerite refers to the locality of the natural sample * Before publication, minerals marked with an asterisk were studied, which was from a soil pro®le at FougeÁres, Brit- approved by the Commission on New Minerals and Mineral tany, France. Names, International Mineralogical Association. Discussion. The authors state that the name fougerite 0003±004X/97/0910±1038$05.00 1038 JAMBOR ET AL.: NEW MINERAL NAMES 1039 has been submitted to the ``IMA Committee,'' but a com- Pr2O3 1.19, Nd2O3 4.26, Y2O3 0.15, CO2 (calc.) 21.95, F plete proposal has not been received by the CNMMN. 3.18, O [ F 1.34, sum 100.63 wt%, corresponding to J.L.J. (Ba1.86Sr0.09Ca0.04)S1.99(Ce0.56La0.24Nd0.15Pr0.04Y0.01)S1.00(CO3)3F1.01. Occurs as prismatic, bladed crystals, up to 1.0 mm long, commonly as dendritic or stellate groups, 2±3 mm across. Gallobeudantite* Color yellow, white, or pinkish gray, white streak, transpar- J.L. Jambor, D.R. Owens, J.D. Grice, M.N. Feinglos ent, vitreous to greasy luster, cleavage not observed, brittle, uneven fracture, VHN 5 280(25), H 5 4.5, D 5 4.7(1), (1996) Gallobeudantite, PbGa3[(AsO4),(SO4)]2(OH)6,a 25 meas 3 new mineral species from Tsumeb, Namibia, and as- Dcalc 5 4.62 g/cm for Z 5 2; effervesces in HCl, non¯u- sociated new gallium analogues of the alunite-jarosite orescent. The infrared spectrum has strong absorption bands family. Can. Mineral., 34, 1305±1315. at 1600±1200, 1100±1060, 900±850, and 745±675 cm21. Optically biaxial negative, a51.584(1), b51.724(3), g One representative electron microprobe analysis (of 5 1.728(3), 2V 5 16(1)8,2V 5 188, Z c 5 26.58 in eight) gave PbO 32.1, ZnO 2.2, Ga O 19.2, Fe O 2.9, meas calc ` 2 3 2 3 obtuse b, medium dispersion r . v, Y 5 b. Single-crystal Al O 8.9, As O 16.0, SO 10.5, P O 0.2, GeO 0.6, H O 2 3 2 5 3 2 5 2 2 X-ray study indicated monoclinic symmetry, space group 8.3 (from stoichiometry and crystal-structure analysis), P2 /m, a 5 13.396(7), b 5 5.067(1), c 5 6.701(1) AÊ , b5 sum 100.9 wt%, corresponding to Pb (Ga Al Fe31 1 1.00 1.43 1.21 0.25 106.58(1)8. Strongest lines of the powder pattern are 4.00 Zn Ge ) [(AsO ) (SO ) (PO ) ] (OH) , ide- 0.19 0.04 S3.12 4 0.96 4 0.91 4 0.02 S1.89 6.41 (100,111,201), 3.269(100,310,202,401), 2.535(20,020, ally PbGa[(AsO ),(SO )] (OH) . This is the Ga analog of 4 4 2 6 112), 2.140(40,221,003,512,600), and 2.003(40, several). beudantite, idealized as PbFe31 [(AsO )(SO )] (OH) . Oc- 3 4 4 2 6 The new name is for A.A. Kukharenko (1914±1993), curs as zones within rhombohedra, up to 200 mm along in recognition of his contributions to the geology of the an edge, in vugs in a single specimen of Cu-bearing sul- Kola Peninsula. The mineral occurs in carbonatites and ®des (renierite, germanite-like, tennantite, and secondary zeolite-carbonate rocks in the Khibina and VuorijaÈrvi al- chalcocite). Crystals are variably pale yellow, greenish, kaline massifs, Kola Peninsula, Russia, in a hornfels xe- or cream-colored; white to pale yellow streak, vitreous nolith at Mont Saint Hilaire, QueÂbec, and in cavities in luster, even to conchoidal fracture, H 5 4, transparent, the Saint-Amable sill, a nepheline syenite related to the brittle, non¯uorescent, possible {001} cleavage, D 5 calc Mont Saint Hilaire alkaline intrusions. Type material is 4.61 g/cm3 for Z 5 3. Optically nonpleochroic, uniaxial in the Mineralogical Museum of the Department of Min- negative, v51.763(5), e51.750(5). Single-crystal eralogy, Saint Petersburg University, Russia, and in the X-ray structure study (R 5 0.078) indicated hexagonal Canadian Museum of Nature, Ottawa. J.L.J. (rhombohedral) symmetry, space group R3m, a 5 7.225(4), c 5 17.03(2) AÊ , isostructural with corkite. Strongest lines of the 114.6 mm Debye±Scherrer powder NezÏilovite* pattern (CoK radiation) are 5.85(90)(101), 3.59(40)(110), a V. Bermanec, D. Holtstam, D. Sturman, A.J. Criddle, 3.038(100)(113), and 2.271(40)(107).