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Kyzylkumite, Ti2V3+O5(OH): new structure type, modularity and revised formula

Published online by Cambridge University Press:  05 July 2018

T. Armbruster ,
B. Lazic ,
L. Z. Reznitsky  and
E. V. Sklyarov
T. Armbruster*
Affiliation:
Mineralogical Crystallography, Institute of Geological Sciences, University of Bern, Freiestr. 3, CH- 3012 Bern, Switzerland
B. Lazic
Affiliation:
Mineralogical Crystallography, Institute of Geological Sciences, University of Bern, Freiestr. 3, CH- 3012 Bern, Switzerland
L. Z. Reznitsky
Affiliation:
Institute of the Earth’s Crust (IZK) SB RAS, 664033 Irkutsk-33, Russia
E. V. Sklyarov
Affiliation:
Institute of the Earth’s Crust (IZK) SB RAS, 664033 Irkutsk-33, Russia
*
* E-mail: armbruster@krist.unibe.ch
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Abstract

The crystal structure of kyzylkumite, ideally Ti2V3+O5 (OH), from the Sludyanka complex in South Baikal, Russia was solved and refined (including the hydrogen atom position) to an agreement index, R1, of 2.34% using X-ray diffraction data collected on a twinned crystal. Kyzylkumite crystallizes in space group P21/c, with a = 8.4787(1), b = 4.5624(1), c = 10.0330(1) Å , β = 93.174(1)º, V = 387.51(1) Å3 and Z = 4. Tivanite, TiV3+O3OH, and kyzylkumite have modular structures based on hexagonal close packing of oxygen, which are made up of rutile [TiO2] and montroseite [V3+O(OH)] slices. In tivanite the rutile:montroseite ratio is 1:1, in kyzylkumite the ratio is 2:1. The montroseite module may be replaced by the isotypic paramontroseite V4+O2 module, which produces a phase with the formula Ti2V4+O6. In the metamorphic rocks of the Sludyanka complex, vanadium can be present as V4+ and V3+ within the same mineral (e.g.in batisivite, schreyerite and berdesinskiite). Kyzylkumite has a flexible composition with respect to the M4+/M3+ ratio. The relationship between kyzylkumite and a closely related Be-bearing kyzylkumite-like mineral with an orthorhombic norbergite-type structure from Byrud mine, Norway is discussed. Both minerals have similar X-ray powder diffraction patterns.

Keywords

kyzylkumitetivaniterutilemontroseitecrystal structurecrystal chemistrytitaniumvanadiummodular structures
Type
Letter
Information
Mineralogical Magazine , Volume 77 , Issue 1 , February 2013 , pp. 33 - 44
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2013

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