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~Ew Mineral Names* American Mineralogist, Volume 68, pages 1248-1252, 1983 ~EW MINERAL NAMES* PETE J. DUNN, MICHAEL FLEISCHER, GEORGE Y. CHAO, LOUIS J. CABRI, AND JOSEPH A. MANDARINO Bijvoetite* Lepersonnite* bright yellow and is transparent and translucent. No fluores- Unnamed Co-Ni-Mg uranyl silicate cence was observed under short- or long-wave VV. The mea- sured density is 3.97 g/cm3. It is optically biaxial negative, 2V M. Deliens and P. Piret (1982) Bijvoetite et lepersonnite, carbon- = 1.638, (3 1.666, 1.682; pleochroic with X pale ates hydrates d'uranyle et des terres rares de Shinkolobwe, 73° calc., a = = 'Y= yellow, Y bright yellow and Z bright yellow; orientation, only Zaire. Can. Mineral., 20, 231-238. Y = c is given. The mineral is orthorhombic, Pnnm or Pnn2 with a 16.23(3), Bijvoetite = b = 38.74(9), c = 11.73(3)A, Z = 2, (V = 7375(50)A3, J .A.M.). Bijvoetite and lepersonnite occur with hydrated uranium ox- The density calculated from the unit cell parameters and the ides near primary uraninite in the lower part of the oxidation empirical formula is 4.01 g/cm3. Strongest lines in the X-ray zone at Shinkolobwe, Zaire. Bijvoetite is rare and is known only powder diffraction pattern (for CuKa) are: 8.15(100)(200), from a single specimen. Associated minerals are: lepersonnite, 4.06(15)(400), 3.65(70)(133), 3.21(50)(0.12.0) and 2.86(40)(283). sklodowskite, curite, uranophane, becquerelite, rutherfordine, An electron microprobe analysis gave: Si02 2.79, V03 76.14, studtite and a Co-Mg-Ni uranyl silicate structurally related to Gd203 2.09, DY203 1.07, Y203 0.41, Tb203 0.09, CaO 0.45, C02 uranophane. 4.02 (by chromatography), H20 12.12 (by TGA), total 99.18 The mineral is present as minute crystals tabular parallel to wt.%. The empirical formula calculated on the basis of 100 {001}; there is a very good cleavage in the plane of the tablets. oxygen ions is Cao.71(Gd1.04DYo.52Y0.32Tbo.06)}:1.94V23.95C8.1O The mineral is sulfur-yellow and transparent to pale-yellow and Si4.180I00. 59.90 H20 or, in oxide form, CaO . (REh03 .24V03 translucent with a vitreous luster. It is not fluorescent under . 8C02 . 4Si02 . 60H20. short- or long-wave ultraviolet light. The Vickers microhardness Lepersonnite's occurrence and associations are given under is 36 kg/mm and D (meas.) is 3.9 g/cm3. Bijvoetite is optically bijvoetite. The name is in honor of Dr. Jacques Lepersonne, biaxial positive, 2V = 84° meas. and 83° calc., a = 1.600, {3= honorary head of the Department of Geology and Mineralogy, 1.650, 'Y= 1.722 (all :to.OO2); pleochroic with X colorless, Y pale Musee royal de I'Afrique centrale at which institution the type yellow and Z dark yellow; orientation, X = c, Y = a. specimens are preserved. Bijvoetite is orthorhombic, C2ma, Cm2b or Cmma, a = 21.22(3), b = 45.30(7), c = 13.38(2)A, Z = 16, (V = 12862(57), Unnamed Co-Mg-Ni uranyl silicate J.A.M.). Crystals are tabular parallel to {001} and elongated Occurring with bijvoetite and lepersonnite is a new Co-Mg-Ni along [110]; the elongation gives a monoclinic aspect to the uranyl silicate. Preliminary study shows that it is structurally crystals. Forms present in order of importance are {001}, {l10}, related to uranophane. Detailed work is in progress. It is similar {130}and {010}. The strongest lines in the X-ray powder diffrac- in appearance to lepersonnite. J .A.M. tion pattern (for CuKa) are: 8.61(80)(041), 6.70(100)(002), 4.16(60)(2.10.0), 3.52(50)(2.10.2, 620), 3.36(50)(004) and 2.996(60)(4.12.1). Kelyanite* An electron microprobe analysis gave: V03 60.66, Y203 7.52, DY203 5.61, Gd203 2.80, Tb203 0.96, C02 8.88 (by chromatogra- V. I. Vasil'ev, Yu. G. Lavrent'ev, and N. A. Pal'chik (1982) phy), H20 13.57 (by difference), total 100.00 wt.%. The empirical Kelyanite, Hg36Sb3(CI,Br)9028, a new mineral. Zapiski Vses. formula given is (Y 1.26DYO.57Gdo.29Tbo.lOh:2.22V 4.01C3.82023 Mineralog. Obshch., 111, 330-334 (in Russian). 14.26H20 or, ideally, (REh(V02C03)iOH)6' -J1H20. The Electron microprobe analyses (standards calomel for Hg and density calculated from the empirical formula and the cell CI, montroydite for 0, synthetic Sb2S3 for Sb, synthetic parameters is 3.907 g/cm3. TI(CI,Br) for Br) gave (av. of 12). Hg 85.6, Sb 4.70, CI 3.31, Br The name is in honor of the Dutch crystallographer, Professor 0.91, 0 5.35, sum 99.87%, corresponding to Hg35.99Sb3.28Ch.82 Johannes Martin Bijvoet (1892-1980). The type specimen is BrO.93028.07, or Hg202Hgt61Sbj'"3(CI,Br)9028' Z 2, D calc. 8.51. preserved at the Musee royale de l' Afrique centrale, Tervuren, = Also possible is HgtlHgt ISb~3(CI,Br)6020, Z = 3, D calc. Belgium. = 8.55. Laser analysis showed Cu and Ag each 0.001%. X-ray study shows kelyanite to be monoclinic, space group Lepersonnite C2/m, C2, Cm, C2/c, or Cc, a = 23.50:tO.12, b = 13.62:tO.06, Lepersonnite occurs as mammilary crusts and as isolated c = 10.31 :to.05A., {3 = 97.01 :to. 12°. The strongest lines (48 spherules made up of radiating acicular crystals. The mineral is given) are 3.78(6)(601), 3.30(10)(621), 3.24(5)(530), 2.72(6)(801), 2.53(6)(114,641), 2.364(5)(803). In transmitted light kelyanite is poorly translucent reddish- Minerals marked with asterisks were approved before publi- brown, pleochroic from reddish-brown to pale brown; in reflect- * cation by the Commission on New Minerals and Mineral Names ed light, grayish-white, anisotropic, birefringence weak. Reflec- of the International Mineralogical Association. tances: 460 nm, 20.5,19.9; 546,18.9,18.1; 620,17.8,17.1%. 0003-004 X/83/ 1112-1248$0.50 1248 NEW MINERAL NAMES 1249 Internal reflections deep brownish-red to raspberry-red. Etch frequently shows red internal reflections and it is polysyntheti- reactions: darkened by KOH and ~onc. HCl, effervesces and cally twinned. The Vickers microhardness is 218 kg/mm2 (25 g dissolves with HN03, with 1: 1 HCl becomes iridescent. Cleav- load). Reflectivity values, max.-min. (~), are: 24.6-21.7(420), age and twinning were not observed; D meas. 8.51-8.63, avo 23.8-21.8(500), 24.1-22.2(540), 24.1-22.9(600) and 21.6-20.1(700 8.57. nm); values are given for 15 wavelengths from 420 nm to 700 nm. The mineral occurs as irregular grains up to 1-2 mm in the Pirquitasite is tetragonal, 142m or 14 with a = 5.786, oxidation zone of the stibnite-cinnabar ores of the Kelyan c = 10.829A, Z = 2, V = 362.5A3. D calc. = 4.822 g/cm3. The deposit, Buryat ASSR, associated with calomel, eglestonite, Sb mineral has a stannite-like structure and is crystallographically oxides, native Hg, and shakhovite. It replaces calomel and is similar to hocartite, Ag2FeSnS4' The strongest lines in the X-ray also replaced by calomel. powder diffraction pattern (21 given for CuK a) are: The name is for the locality. Type material is at the Central 3.267(10)(112), 2.901(4)(200), 2.049(6)(220), 1.976(8)(204), Siberian Geological Museum, Novosibirsk, and the Fersman 1.735(8)(132), 1.289(4)(240) and 1.165(4)(244). Mineralogical Museum, Moscow. M.F. Data from 21 electron microprobe analyses are given showing that there is extensive solid solution between pirquitasite and hocartite (12 to 67 mol%). The grain which was closest to end- member pirquitasite has: Ag 39.72, Cu 0.06, Zn 11.40, Fe 1.31, Khanneshite* Sn 23.12, S 24.42, total 99.18. The empirical formula (based on 8 G. E. Eremenko and V. A. Bel'ko (1982) Khanneshite, (Na,Cah atoms per formula unit) derived from these data is: (Ag1.93 (Ba,Sr,RE,Cah(C03h, a new mineral of the burbankite group. CUo.olh:I.94(ZnO.92Feo.12h:l.04Snl.02S4.00 or, ideally, (Ag,Cuh Zapiski Vses. Mineralog. Obshch., 111,321-324 (in Russian). (Zn,Fe)SnS4' The mineral occurs with hocartite, pyrite, marcasite, wurtzite, Analyses (by V.A.B.) gave BaO 38.85, 38.30; SrO 5.80, 6.50; franckeite, miargyrite, aramayoite, chalcostibite, stannite, kes- CaO 6.13, 7.30; MnO 0.08, 0.07; Na20 6.99, 6.55; K20 0.77, terite, rhodostannite and cassiterite in the Pirquitas deposit, 0.60; Fe203 0.13,0.25; Ah03 0.26,0.12; Si02 0.39,0.70; RE203 Jujuy province, Rinconada department, Argentina. The name is 8.43, 8.71; C02 24.56, 22.66; S03 4.91, 6.98; H20+ 1.46, 1.30; for the deposit. Type material is preserved at l'Ecole nationale H20- 0.07, none; sum 99.98, 100.87%. After deducting barite, des mines in Paris. chlorite, and dolomite, these correspond to (Na2.13C£l{).87)(Ba1.s2 Sro.3sREo.49Ko.IS)C4.960IS . 0.67H20, and (Na2.o2C£l{).9s)(Ba1.ssUnnamed (Ag,CuhFeSn3Ss Sro.6oREo.5IC£l{).2SKo.12)C4.S90IS. 0.5H20. The rare earths by spectrographic analysis by L. K. Magur, were La2o.2Ce44.6Pr6.o Electron microprobe analyses of several grains of the rhodo- stannite (Cu2FeSn3SS) associated with the pirquitasite show that Nd9.s Sm6.oEuo.IGd4.sDYo.3Hoo.2Ero.sTmo.osYbo.sY7.S and La2o.9 they are essentially free of Zn and that they contain significant CeS1.2Pr4.7Nd7.3Sm4.7Euo.1 Gd3.7DYo.4Hoo.1 ErO.9 Tmo.56 Ybo.2 Y 5.S, i.e., selective Ce type.
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