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New Mineral Names*,† American Mineralogist, Volume 101, pages 2570–2573, 2016 New Mineral Names*,† DMITRIY I. BELAKOVSKIY1, OLIVIER C. GAGNE2, AND YULIA UVAROVA3 1Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18 korp. 2, Moscow 119071, Russia 2Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada 3CSIRO Mineral Resources, CSIRO, ARRC, 26 Dick Perry Avenue, Kensington, Western Australia 6151, Australia IN THIS ISSUE This New Mineral Names has entries for 9 new mineral species, including dmisokolovite, geschieberite, imayoshiite, palladosilicide, plášilite, raisaite, shchurovskyite, svornostite, and vanackerite. GESCHIEBERITE* AND SVORNOSTITE* 3.681 (18; 311), 3.403 (12; 013), 3.304 (15; 401,113), 3.006 (17; 122). The unit-cell parameters refined from powder-diffraction data are: a = J. Plášil, J. Hloušek, A.V. Kasatkin, R. Škoda, M. Novàk and J. Čejka 13.786(5), b = 7.278(3), c = 11.536(4) Å, V = 1157.4 Å3. Single-crystal (2015) Geschieberite, K (UO )(SO ) (H O) , a new uranyl sulfate 2 2 4 2 2 2 X-ray diffraction data collected on a crystal of size 0.19 × 0.11 × 0.09 mm mineral from Jáchymov. Mineralogical Magazine, 79(1), 205–216. refined to R = 0.028 for 1882 unique reflections with I ≥ 3σ(I) shows J. Plášil, J. Hloušek, A.V. Kasatkin, M. Novák, J. Čejka and L. Lapčák 1 geschieberite is orthorhombic, Pna2 , with a = 13.7778(3), b = 7.2709(4), (2015) Svornostite, K Mg[(UO )(SO ) ] ∙8H O , a new uranyl sulfate 1 2 2 4 2 2 2 c = 11.5488(2) Å, V = 1156.92 Å3, Z = 4. mineral from Jáchymov, Czech Republic. Journal of Geosciences, Svornostite forms bright yellow aggregates of light yellow elongated 60, 113–121. by [001] and flattened on {100} crystals up to 0.2 mm. The crystals are transparent to translucent with a vitreous luster and very pale yellow streak. Two new uranyl sulfates, geschieberite (IMA 2014-006), ide- The cleavage is perfect on {100} and {010}. The density was not measured; ally K (UO )(SO ) (H O) and svornostite (IMA 2014-078), ideally 2 2 4 2 2 2 D = 3.268 g/cm3. The mineral is optically biaxial (+), α = 1.548(2), β = K Mg[(UO )(SO ) ] ∙(H O) were recently discovered in the Geschieber calc 2 2 4 2 2 2 8 1.556(3), γ = 1.585(2) (590 nm). The 2V was not measured; 2V = 56°; vein at the Svornost mine, Jáchymov (Joachimsthal), Western Bohemia, calc Z = c. No dispersion was observed. The mineral is non-pleochroic; the Czech Republic, and named for their type locality. The Jáchymov ore color in transmitted light is not given. The average of 6 electron probe EDS district is a classic example of the Variscan hydrothermal vein type of analysis [wt% (range)] is: K O 7.93 (7.34–8.31), MgO 3.11 (2.75–3.93), deposit, so-called five-element formation, Ag–Bi–Co–Ni–U. Both new 2 CuO 0.79 (0–2.40), SO 28.13 (25.44–30.70), UO 48.94 (44.99–51.72), minerals are the supergene products of the post mining alteration of the 3 3 H O (by stoichiometry according structure model) 12.53, total 101.43. That uraninite and sulfides of the primary ore. They occur in the close association 2 yields the empirical formula K (Mg Cu ) (U O )(S O ) (H O) with each another and with adolfpateraite, gypsum and mathesiusite. Both 1.94 0.89 0.11 Σ1.00 0.99 2 1.01 4 4 2 8 based on 28 O apfu. The strongest powder X-ray diffraction lines are [d minerals exhibit strong yellowish green fluorescence under both short- and Å (I%; hkl)]: 8.279 (50; 010), 6.398 (100; 200), 5.060 (55; 210), 4.645 long-wave UV radiation. Both are brittle, have an uneven fracture, and (40; 012), 4.610 (38; 211), 3.881 (34; 021), 3.318 (44; 221), 3.009 (44; estimated Mohs hardness of ~2. Both are unstable under electron beam so 213). The unit-cell parameters refined from powder-diffraction data are: a the EDS mode was chosen for electron probe measurements. = 12.787(3), b = 8.275(2), c = 11.222(3) Å, V = 1187.5 Å3. Single-crystal Geschieberite forms bright green, compact crystalline aggregates X-ray diffraction data collected on a crystal 0.24× 0.07 × 0.05 mm refined composed of multiple intergrowths of prismatic {010} crystals elongated to R = 0.023 for 2745 reflections with I > 3σ[I] shows svornostite is on [001] typically 0.1–0.2 mm across sometimes modified by {001}. 1 obs orthorhombic, space group Pnm2 , a = 12.7850(3), b = 8.2683(4), c = The crystals are translucent pale green with greenish-white streak and 1 11.2163(3) Å, V = 1185.68 Å3, Z = 2. a vitreous luster. The cleavage is perfect on {100}. The density could The Raman spectra of both new minerals are similar and shows bands not be measured due to paucity of pure material; D = 3.259 g/cm3. calc [geschieberite / svornostite (cm-1) w = weak, vs = very strong] at: 3594 and Geschieberite is slightly soluble in cold H O. It is optically biaxial (–), β 2 3506 / 3622, 3545, and 3496 (υ O-H stretching vibrations of the hydrogen- = 1.596(2), γ = 1.634(4) (590 nm); X = a. In a plane-polarized transmitted bonded H O molecules); 1216, 1126, and 1008 / 1220, 1200, 1155, and light, the mineral is nearly colorless with no apparent pleochroism. The 2 1110 [υ (SO )2– antisymmetric stretching; 992 and 984 / 1028 and 989 [υ average of 7 electron probe EDS analyses is [wt% (range)]: Na O 0.23 3 4 1 2 (SO )2– symmetric stretching]; 832vs / 854vs [υ (UO )2+ symmetric stretch- (0.12–0.59), K O 14.29 (12.90–16.66), MgO 2.05 (1.77–2.52), CaO 0.06 4 1 2 2 ing]; 652, 606, and 584 / 643 and 610 [υ (δ) (SO )2– bending]; 470, 456, and (0–0.12), UO 49.51 (47.23–51.64), SO 27.74 (26.82–28.78), H O 6.36 4 4 3 3 2 426 / 458 and 438 [υ (δ) (SO )2– bending]; 386 / 322 (libration mode of (by structure refinement), total 100.24. This gives the empirical formula 2 4 H O or υ U-Oligand vibration); ~350w (K-O stretching); 270s, 250s, and (K Mg Na Ca ) (U O )(S O ) (H O) based on 12 O apfu. 2 1.72 0.29 0.04 0.01 Σ2.06 0.98 2 0.98 4 2 2 2 230s / 268w with a 207 shoulder [υ (δ) (UO )2+ bending]; 180, 154, 132, The strongest lines in the X-ray powder-diffraction pattern [d Å (I%; hkl)] 2 2 100, 80 / 186, 132, and 75 (lattice modes). The structure of geschieberite are: 6.882 (100; 200), 5.622 (53; 111), 4.589 (12; 211), 4.428 (16; 202), 2– consists of [(UO2)(SO4)2(H2O)] sheets based on the protasite anion topol- ogy and stacked perpendicular to a. Interlayer linkage is provided by K * All minerals marked with an asterisk have been approved by the IMA CNMMC. and one H2O, while the other H2O molecule is localized at the free vertex † For a complete listing of all IMA-validated unnamed minerals and their codes, of the uranyl pentagonal bipyramid in the structural unit. The structure is see http://pubsites.uws.edu.au/ima-cnmnc/. identical to that of the synthetic compound K2[(UO2)(SO4)2(H2O)](H2O). 0003-004X/16/0011–2570$05.00/DOI: http://dx.doi.org/10.2138/am-2016-NMN1011121 2570 NEW MINERAL NAMES 2571 2– In svornostite the structural unit [(UO2)(SO4)2(H2O)] is represented by PALLADOSILICIDE* infinite chains parallel to c. In the chains UO pentagonal bipyramids shares 7 L.J. Cabri, A.M. Mcdonald, C.J. Stanley, N.S. Rudashevsky, G. Poirier, four of the equatorial vertices with SO tetrahedra with each tetrahedron 4 H.R. Wilhelmij, W. Zhe and V.N. Rudashevsky (2015) Palladosilicide, is linked to two uranyl bipyramids The free, non-linking equatorial vertex Pd Si, a new mineral from the Kapalagulu Intrusion, Western Tanzania of the uranyl bipyramid is occupied by an H O molecule. The adjacent 2 2 and the Bushveld Complex, South Africa. Mineralogical Magazine, chains are linked through the Mg-octahedra sharing the apical O atoms of 79(2), 295–307. the SO4 groups of the chains and additionally by the K–O bonds and also H-bonds involving H O molecules. The structural formula of svornostite 2 Palladosilicide (IMA 2014-080), ideally Pd Si, is a new mineral found is K Mg[(UO )(SO ) (H O)] (H O) . The uranyl sulfate chains are the 2 2 2 4 2 2 2 2 6 at the platinum-group element (PGE)-chromite horizon of the Kapalagulu same as found in the structures of bobcookite and several of synthetic Intrusion near the eastern shore of Lake Tanganyika, western Tanzania, uranyl sulfates. The type specimens of geschieberite and svornostite are as well as in the UG-2 chromitite, Bushveld Complex, RSA. Associated deposited in the Fersman Mineralogical Museum of the Russian Academy minerals include chromite, pentlandite, pyrrhotite/troilite, chalcopyrite, of Sciences, Moscow, Russia. O.C.G. and D.B. magnetite, along with gudmundite, arsenopyrite, zircon, galena, and IMAYOSHIITE* anglesite. Thirteen grains of palladosilicide were found ranging in size from 0.7–39.1 μm, anhedral to subhedral habit, either free or attached to D.
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