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American Mineralogist; April 2005; v. 90; no. 4; p. 768-773; DOI: 10.2138/am.2005.432
© 2005 Mineralogical Society of America
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New Mineral Names*

Paula C. Piilonen1,{dagger}, T. Scott Ercit1,{ddagger} and Andrew C. Roberts2

1 Research Division, Canadian Museum of Nature, P.O. Box 3443, Stn. D, Ottawa, Ontario K1P 6P4, Canada
2 Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada

Correspondence: {dagger} E-mail: ppiilonen@mus-nature.ca

The first 20% of the full text of this article appears below.

ANKINOVICHITE

Karpenko, V.Yu., Pautov, L.A., Sokolova, E.V., Hawthorne, F.G., Agakhanov, A.A., Dikaya, T.V., Bekenova, G.K. (2004) Ankinovichite, the nickel analogue of alvanite, a new mineral from Kurumsak (Kazakhstan) and Kara-Chagyr (Krygyzstan). Zapiski Vseross. Mineral. Obshch. 133(2), 59–70 (in Russian, English abstract).

Ankinovichite is described from two localities—Kurumsak, Chminken Oblysy, Kazakhstan, and Mount Kara-Chagyr, Osh Oblast, Krygyzstan). The material from Kurumsak occurs as crusts of prismatic, pale green, elongate crystals up to 0.5 mm. The material from Mount Kara-Chagyr occurs as green to light blue, tabular, commonly elongate crystals 0.05 to 0.2 mm in length. The crystals often occur in aggregates, and are commonly twinned. Ankinovichite is brittle, with perfect (010) cleavage, Mohs hardness 2.5 to 3, microindentation hardness VHN 68 kg/mm2. The mineral is transparent and vitreous. Electron microprobe analyses (Kara-Chagyr/Kurumsak) gave Al2O3 33.82/33.79, SiO2 0.59/0.67, V2O5 28.41/27.98, FeO 0.14/0.35, NiO 8.43/7.19, CuO 0.27/0.20, ZnO 2.24/4.20, H2O 23.30 (Penfield method)/25.65(by difference), sum 97.20/100.00 wt%, corresponding to (Ni0.68Zn0.17Cu0.02Fe0.01){sum}0.88Al4(VO3)1.88Si0.06 (OH)12.12(H2O)2.67 for material from Kara-Chagyr and (Ni0.58Zn0.31 Cu0.02Fe0.03){sum}0.94Al4(VO3)1.85Si0.06(OH)12.27(H2O)2.46 for material from Kurumsak. The simplified general formula is (Ni,Zn)Al4 (VO3)2(OH)12·2H2O based on 4 Al atoms pfu. The IR spectrum of ankinovichite contains bands at 3570, 3460, and 3175, 1735, and 1620 cm–1, as well as less intense bands in the range from 1025 to 465 cm–1. Neither a discussion of the IR spectrum nor identification of the absorption bands is given. It is biaxial negative, {alpha} = 1.653(2) ß = 1.677(2), {gamma} = 1.706(3), 2Vobs-86(2)°, 2Vcalc-86°. Ankinovichite has parallel extinction, positive elongation, is non-pleochroic and non-fluorescent under UV radiation.

The crystal structure of ankinovichite was refined on a 0.06 x 0.004 x 0.006 . . . [Full Text of this Article]






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