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European Journal of Mineralogy; February 2000; v. 12; no. 1; p. 95-104; DOI: 10.1127/0935-1221/2000/0012-0095
© 2000 E. Schweizerbart'sche Verlagsbuchhandlung Science Publishers
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Articles

Crystal structure of pushcharovskite

Dmitry Yu. PUSHCHAROVSKY1,*), Simon J. TEAT2), Vyatcheslav N. ZAITSEV2), Natalia V. ZUBKOVA1) and Halil SARP3)

1) Geology Department, Moscow State University, 119899 Moscow Russia
2) CCLRC Daresbury Laboratory, Daresbury, Warrington. Cheshire WA4 4AD, UK
3) Département de Minéralogie du Museum d'Histoire naturelle de Genève, 1, route de Malagnou, CH-1208 Genève, Switzerland

* E-mail: dmitp{at}geol.msu.ru

Pushcharoskite, K0.02Cu1.125As0.94O5.515H4.06 (ideally CuAsO3(OH)·1.5H2O), M = 235.02, is triclinic, with space group P1, a = 13.6164(7), b = 15.6672(8), c = 19.1869(9) Å, {alpha} = 106.933(2), ß = 91.531(2), {gamma} = 98.401(2)°, V = 3863.3(3) Å3, Z = 32, {phi}o = 3.35, {phi}c = 3.235 g/cm3, µ = 11.40 mm–1. The crystal structure of pushcharovskite was solved and refined against data collected at the Daresbury Synchrotron Radiation Facility, using a 60 x 20 x 5 µm3 single crystal, {lambda} = 0.6883 Å, F(000) = 3590, R 0.054 for 8343 reflections with I > 2{sigma}(I). Pushcharovskite is a mineral characterized by some structural disorder and by the following general formula: K0.6Cu18[AsO2.8(OH)1.2]15(OH)9.6·18.6(H2O); the corresponding structural formula is K0.6Cu18[AsO2(OH)2]4 [AsO3(OH)]10[AsO4](OH)9.6·18.6(H2O). The structure contains heteropolyhedral sheets (110) formed by Cu,O polyhedra (square bipyramids and square pyramids) and by As,O,OH tetrahedra. The sheets are linked by hydrogen bonding involving the water molecules of the Cu square bipyramids and pyramids, the OH groups of the As,O,OH tetrahedra and H2O molecules localized in the interlayers. A small amount of distorted K octahedra with partial occupancy reinforce these contacts. Some vacancies in the positions of Cu atoms were revealed. The mineral is structurally related to geminite, Cu(AsO3OH)·H2O, yvonite, Cu(AsO3OH)·2H2O and fluckite, CaMn(AsO3OH)2·2H2O.

Key-words: pushcharovskite, crystal structure, arsenate, geminite, yvonite.




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