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GEOREF RECORD

The crystal structure of vergasovaite Cu (sub 3) O[Mo,S)O (sub 4) SO (sub 4) ], and its relation to synthetic Cu (sub 3) O[MoO (sub 4) ] (sub 2)

Peter Berlepsch, Thomas Armbruster, Joel Brugger, Elena Y. Bykova and Pavel M. Kartashov
The crystal structure of vergasovaite Cu (sub 3) O[Mo,S)O (sub 4) SO (sub 4) ], and its relation to synthetic Cu (sub 3) O[MoO (sub 4) ] (sub 2)
European Journal of Mineralogy (February 1999) 11 (1): 101-110

Abstract

The structure of vergasovaite, space group Pnma, Z = 4, a 7.421, b 6.754, c 13.624 Aa) has been refined to R 3.99 %. The new mineral is isostructural with synthetic Cu (sub 3) O[MoO (sub 4) ] (sub 2) but has the very unusual substitution of S (super 6+) (ionic radius 0.12 Aa) for Mo (super 6+) (ionic radius 0.41 Aa) in tetrahedral coordination. The synthetic and natural structures are both characterized by edge-sharing zigzag chains of Jahn-Teller distorted Cu (super 2+) O (sub 6) octahedra with attached Cu (super 2+) in five-fold pyramidal coordination (4 + 1). The strongly distorted Cu ribbons are connected by S (super 6+) - and Mo (super 6+) -bearing tetrahedra to form a three-dimensional framework. The subsitutional disorder of S and Mo leads to strong static disorder in the entire structure as revealed by relatively high atomic displacement parameters for all atoms. It is suggested that an end-member of the type Cu (sub 3) O[SO (sub 4) ] (sub 2) may not be stable due to the restricted flexibility of the square pyramidal coordination of Cu (super 2+) .


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 11
Serial Issue: 1
Title: The crystal structure of vergasovaite Cu (sub 3) O[Mo,S)O (sub 4) SO (sub 4) ], and its relation to synthetic Cu (sub 3) O[MoO (sub 4) ] (sub 2)
Affiliation: Universitaet Basel, Mineralogich-Petrographisches Institut, Basel, Switzerland
Pages: 101-110
Published: 199902
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 18
Accession Number: 1999-033846
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables
Secondary Affiliation: Universitaet Bern, CHE, SwitzerlandRussian Academy of Sciences, RUS, Russian Federation
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199912
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