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• 作者：I. V. Pekov (1)
  N. V. Chukanov (2)
  Ya. E. Filinchuk (3)
  A. E. Zadov (4)
  N. N. Kononkova (5)
  S. G. Epanchintsev (6)
  P. Kaden (7)
  A. Kutzer (7)
  J. G?ttlicher (8)
  
• 刊名：Geology of Ore Deposits
• 出版年：2013
• 出版时间：December 2013
• 年：2013
• 卷：55
• 期：7
• 页码：558-566
• 全文大小：1,006 KB
• 作者单位：I. V. Pekov (1)
  N. V. Chukanov (2)
  Ya. E. Filinchuk (3)
  A. E. Zadov (4)
  N. N. Kononkova (5)
  S. G. Epanchintsev (6)
  P. Kaden (7)
  A. Kutzer (7)
  J. G?ttlicher (8)
  
  1. Faculty of Geology, Moscow State University, 119991, Moscow, Russia
  2. Institute of Problems of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow oblast, Russia
  3. Institute of Condensed Matter and Nanosciences, Université Catholique de Louvain, Place Louis Pasteur, B-1348, Louvain-la-Neuve, Belgium
  4. NPP Teplokhim OOO, Dmitrovskoe sh. 100, Building 2, Moscow, 127238, Russia
  5. Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, 117975, Moscow, Russia
  6. ul. Fabrichnaya 6-2, Emanzhelinka, Chelyabinsk oblast, 456574, Russia
  7. Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal, Hermann-von-Helmholtz-Platz 1, D-76344, Eggenstein-Leopoldshafen, Germany
  8. Karlsruhe Institute of Technology, Institute for Synchrotron Radiation, Hermann-von-Helmholtz-Platz 1, D-76344, Eggenstein-Leopoldshafen, Germany
  
• ISSN：1555-6476

文摘

A new mineral, kasatkinite, Ba2Ca8B5Si8O32(OH)3 · 6H2O, has been found at the Bazhenovskoe chrysotile asbestos deposit, the Central Urals, Russia in the cavities in rhodingite as a member of two assemblages: (l) on prehnite, with pectolite, calcite, and clinochlore; and (2) on grossular, with diopside and pectolite. Kasatkinite occurs as spherulites or bunches up to 3 mm in size, occasionally combined into crusts. Its individuals are acicular to hair-like, typically split, with a polygonal cross section, up to 0.5 mm (rarely, to 6 mm) in length and to 20 μm in thickness. They consist of numerous misoriented needle-shaped subindividuals up to several dozen μm long and no more than 1 μm thick. Kasatkinite individuals are transparent and colorless; its aggregates are snow white. The luster is vitreous or silky. No cleavage was observed; the fracture is uneven or splintery for aggregates. Individuals are flexible and elastic. The Mohs-hardness is 4-.5. D meas = 2.95(5), D calc = 2.89 g/cm3. Kasatkinite is optically biaxial (+), α = 1.600(5), β = 1.603(2), γ = 1.626(2), 2V meas = 30(20)°, 2V calc = 40°. The IR spectrum is given. The 11B MAS NMR spectrum shows the presence of BO4 in the absence of BO3 groups. The chemical composition of kasatkinite (wt %; electron microprobe, H2O by gas chromatography) is as follows: 0.23 Na2O, 0.57 K2O, 28.94 CaO, 16.79 BaO, 11.57 B2O3, 0.28 Al2O3, 31.63 SiO2, 0.05 F, 9.05 H2O, ?.02 ?O=F2; the total is 99.09. The empirical formula (calculated on the basis of O + F = 41 apfu, taking into account the TGA data) is: Na0.11K0.18Ba1.66Ca7.84B5.05Al0.08Si8.00O31.80(OH)3.06F0.04 · 6.10H2O. Kasatkinite is monoclinic, space group P21/c, P2/c, or Pc; the unit-cell dimensions are a = 5.745(3), b = 7.238(2), c = 20.79 (1) ?, β = 90.82(5)°, V = 864(1) ?3, Z = 1. The strongest reflections (d ?-em class="a-plus-plus">I[hkl]) in the X-ray powder diffractions pattern are: 5.89-4[012], 3.48-.1[006], 3.36-4[114]; 3.009-00[ $12\bar 1$ , 121, $10\bar 6$ ], 2.925-5[106, $12\bar 2$ , 122], 2.633-3[211, 124], 2.116-9[ $13\bar 3$ , 133, 028]. Kasatkinite is named in honor of A.V. Kasatkin (b. 1970), a Russian amateur mineralogist and mineral collector who has found this mineral. Type specimen is deposited in the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow.