Geology of Ore Deposits

, Volume 55, Issue 7, pp 558–566 | Cite as

Kasatkinite, Ba2Ca8B5Si8O32(OH)3 · 6H2O6, a new mineral from the Bazhenovskoe deposit, the Central Urals, Russia

  • I. V. Pekov
  • N. V. Chukanov
  • Ya. E. Filinchuk
  • A. E. Zadov
  • N. N. Kononkova
  • S. G. Epanchintsev
  • P. Kaden
  • A. Kutzer
  • J. Göttlicher
Article

Abstract

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 4–4.5. Dmeas = 2.95(5), Dcalc = 2.89 g/cm3. Kasatkinite is optically biaxial (+), α = 1.600(5), β = 1.603(2), γ = 1.626(2), 2Vmeas = 30(20)°, 2Vcalc = 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, −0.02 −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) Å, β = 90.82(5)°, V = 864(1) Å3, Z = 1. The strongest reflections (d Å–I[hkl]) in the X-ray powder diffractions pattern are: 5.89–24[012], 3.48–2.1[006], 3.36–24[114]; 3.009–100[\(12\bar 1\), 121, \(10\bar 6\)], 2.925–65[106, \(12\bar 2\), 122], 2.633–33[211, 124], 2.116–29[\(13\bar 3\), 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.

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© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  • 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. Göttlicher
    • 8
  1. 1.Faculty of GeologyMoscow State UniversityMoscowRussia
  2. 2.Institute of Problems of Chemical PhysicsRussian Academy of SciencesChernogolovka, Moscow oblastRussia
  3. 3.Institute of Condensed Matter and NanosciencesUniversité Catholique de LouvainLouvain-la-NeuveBelgium
  4. 4.NPP Teplokhim OOOMoscowRussia
  5. 5.Institute of Geochemistry and Analytical ChemistryRussian Academy of SciencesMoscowRussia
  6. 6.Emanzhelinka, Chelyabinsk oblastRussia
  7. 7.Karlsruhe Institute of TechnologyInstitute for Nuclear Waste DisposalEggenstein-LeopoldshafenGermany
  8. 8.Karlsruhe Institute of TechnologyInstitute for Synchrotron RadiationEggenstein-LeopoldshafenGermany

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