naa a22 4500 510736475 CHVBK 20180411092754.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1134/S1075701513080114 doi (NATIONALLICENCE)springer-10.1134/S1075701513080114 Kyzylkumite: a finding in the southern Baikal region, Russia and refinement of its crystal chemical formula [Elektronische Daten] [L. Reznitsky, E. Sklyarov, T. Armbruster, L. Suvorova, Z. Uschapovskaya, S. 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. Pleiades Publishing, Ltd., 2013 Reznitsky L. Institute of the Earth's Crust, Siberian Branch, Russian Academy of Sciences, ul. Lermontova 128, 664033, Irkutsk, Russia aut Sklyarov E. Institute of the Earth's Crust, Siberian Branch, Russian Academy of Sciences, ul. Lermontova 128, 664033, Irkutsk, Russia aut Armbruster T. University of Bern, Friestrasse 3, CH-3012, Bern, Switzerland aut Suvorova L. Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, ul. Favorskogo 1A, 664033, Irkutsk, Russia aut Uschapovskaya Z. Institute of the Earth's Crust, Siberian Branch, Russian Academy of Sciences, ul. Lermontova 128, 664033, Irkutsk, Russia aut Kanakin S. Geological Institute, Siberian Branch, Russian Academy of Sciences, ul. Sakh'yanovoi 6, 670042, Ulan-Ude, Russia aut Geology of Ore Deposits Springer US; http://www.springer-ny.com 55/8(2013-12-01), 676-685 1075-7015 55:8<676 2013 55 11477 https://doi.org/10.1134/S1075701513080114 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1075701513080114 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Reznitsky L. Institute of the Earth's Crust, Siberian Branch, Russian Academy of Sciences, ul. Lermontova 128, 664033, Irkutsk, Russia aut NATIONALLICENCE 700 1- Sklyarov E. Institute of the Earth's Crust, Siberian Branch, Russian Academy of Sciences, ul. Lermontova 128, 664033, Irkutsk, Russia aut NATIONALLICENCE 700 1- Armbruster T. University of Bern, Friestrasse 3, CH-3012, Bern, Switzerland aut NATIONALLICENCE 700 1- Suvorova L. Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, ul. Favorskogo 1A, 664033, Irkutsk, Russia aut NATIONALLICENCE 700 1- Uschapovskaya Z. Institute of the Earth's Crust, Siberian Branch, Russian Academy of Sciences, ul. Lermontova 128, 664033, Irkutsk, Russia aut NATIONALLICENCE 700 1- Kanakin S. Geological Institute, Siberian Branch, Russian Academy of Sciences, ul. Sakh'yanovoi 6, 670042, Ulan-Ude, Russia aut NATIONALLICENCE 773 0- Geology of Ore Deposits Springer US; http://www.springer-ny.com 55/8(2013-12-01), 676-685 1075-7015 55:8<676 2013 55 11477 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 334509378 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer