Geology of Ore Deposits

, Volume 55, Issue 8, pp 676–685 | Cite as

Kyzylkumite: a finding in the southern Baikal region, Russia and refinement of its crystal chemical formula

  • L. Z. ReznitskyEmail author
  • E. V. Sklyarov
  • T. Armbruster
  • L. F. Suvorova
  • Z. F. Uschapovskaya
  • S. V. Kanakin


Kyzylkumite has been found in Cr-V-bearing metamorphic rocks of the Sludyanka Complex, Southern Baikal region; it has been identified by X-ray powder diffraction method. This is a late secondary mineral developed after Ti-V-oxides (schreyerite, berdesinskiite) and V-bearing rutile and titanite. Kyzylkumite represents a new structural type with composition Ti4V 2 3+ O10(OH)2 corresponding to octahedral coordination of Ti4+ and V3+. Its unit-cell dimensions are: a = 8.4787(1), b = 4.5624(1), c = 10.0330(1) Å, β = 93.174(1)°. The ideal formula of kyzylkumite Ti4V 2 3+ O10(OH)2 corresponds to composition, wt %: 65.56 TiO2, 30.75 V2O3, 3.69 H2O. Indeed, the contents (wt %) of these constituents range from 62 to 70 TiO2 and from 23 to 33 V2O3. Variations in contents and the Ti/V value are caused by partial substitution V3+ for V4+, isovalent substitutions Ti4+ and V3+ for V4+ and Cr3+, respectively, and coupled substitution V3+ + OH ⇒ Ti4+ + O2−. Smyslova et al. (1981)—the discovereres of kyzylkumite—assumed its composition to be the same as for schreyerite V 2 3+ Ti3O9 that principally different from kyzylkumite from the Sludyanka Complex. Therefore, re-examination of the kyzylkumite holotype or cotype from its type locality is needed.


Rutile Titanite Unit Cell Dimension Ideal Formula Versus Oxide 
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© Pleiades Publishing, Ltd. 2013

Authors and Affiliations

  • L. Z. Reznitsky
    • 1
    Email author
  • E. V. Sklyarov
    • 1
  • T. Armbruster
    • 2
  • L. F. Suvorova
    • 3
  • Z. F. Uschapovskaya
    • 1
  • S. V. Kanakin
    • 4
  1. 1.Institute of the Earth’s Crust, Siberian BranchRussian Academy of SciencesIrkutskRussia
  2. 2.University of BernBernSwitzerland
  3. 3.Institute of Geochemistry, Siberian BranchRussian Academy of SciencesIrkutskRussia
  4. 4.Geological Institute, Siberian BranchRussian Academy of SciencesUlan-UdeRussia

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