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GEOREF RECORD

Crystal structure of pushcharovskite

Dmitry Yu. Pushcharovsky, Simon J. Teat, Vyatcheslav N. Zaitsev, Natalia V. Zubkova and Halil Sarp
Crystal structure of pushcharovskite
European Journal of Mineralogy (February 2000) 12 (1): 95-104

Abstract

Pushcharovskite, K (sub 0.02) Cu (sub 1.125) As (sub 0.94) O (sub 5.515) H (sub 4.06) (ideally CuAsO (sub 3) (OH).1.5H (sub 2) O), M = 235.02, is triclinic, with space group P1, a = 13.6164(7), b = 15.6672(8), c = 19.1869(9) A, alpha = 106.933(2), beta = 91.531(2), gamma = 98.401(2) degrees , V = 3863.3(3) A (super 3) , Z = 32, rho (sub o) = 3.35, rho (sub c) = 3.235 g/cm (super 3) , mu = 11.40 mm (super -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 mu m (super 3) single crystal, lambda = 0.6883 A, F(000) = 3590, R 0.054 for 8343 reflections with I > 2sigma (I). Pushcharovskite is a mineral characterized by some structural disorder and by the following general formula: K (sub 0.6) Cu (sub 18) [AsO (sub 2.8) (OH) (sub 1.2) ] (sub 15) (OH) (sub 9.6) .18.6(H (sub 2) O); the corresponding structural formula is K (sub 0.6) Cu (sub 18) [AsO (sub 2) (OH) (sub 2) ] (sub 4) [AsO (sub 3) (OH)] (sub 10) [AsO (sub 4) ](OH) (sub 9.6) .18.6(H (sub 2) O). 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 H (sub 2) O 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(AsO (sub 3) OH).H (sub 2) O, yvonite, Cu(AsO (sub 3) OH).2H (sub 2) O and fluckite, CaMn(AsO (sub 3) OH) (sub 2) .2H (sub 2) O.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 12
Serial Issue: 1
Title: Crystal structure of pushcharovskite
Affiliation: Moscow State University, Geology Department, Moscow, Russian Federation
Pages: 95-104
Published: 200002
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 19
Accession Number: 2000-027046
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
Secondary Affiliation: CCLRS Daresbury Laboratory, GBR, United KingdomMuseum d'Histoire Naturelle de Geneve, CHE, Switzerland
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200009
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