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The crystal structure of carminite: refinement and bond valence calculations

Published online by Cambridge University Press:  05 July 2018

Kharisun ,
Max R. Taylor ,
D. J. M Bevan  and
Allan Pring
Kharisun
Affiliation:
Department of Chemistry, The Flinders University of South Australia, GPO Box 2100 Adelaide, S. A. 5001, Australia
Max R. Taylor
Affiliation:
Department of Chemistry, The Flinders University of South Australia, GPO Box 2100 Adelaide, S. A. 5001, Australia
D. J. M Bevan
Affiliation:
Department of Chemistry, The Flinders University of South Australia, GPO Box 2100 Adelaide, S. A. 5001, Australia
Allan Pring
Affiliation:
Department of Mineralogy, South Australian Museum, North Terrace, S. A. 5000, Australia
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Abstract

The crystal structure of carminite, PbFe2(AsO4)2(OH)2 has been refined. The mineral is orthorhombic, Cccm with a = 16.591(2), b = 7.580(1), c = 12.285(1) Å, Z = 8; the structure has been refined to a conventional R = 3.3% using 913 observed reflections [I>2σ(I)]. The structure contains stepped chains of edge-sharing pairs of Fe(O,OH)6 octahedra; these chains are linked by AsO4 tetrahedra and Pb atoms in distorted square antiprismatic co-ordination. The hydrogen bonding network in the structure has been modelled using bond valence calculations.

Keywords

carminitecrystal structure refinementhydrogen bonding network
Type
Mineralogy
Information
Mineralogical Magazine , Volume 60 , Issue 402 , October 1996 , pp. 805 - 811
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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Footnotes

*

Present address: Agriculture Faculty, General Sordirman University, P.O. Box 25, Purkwokerto 53101, Central Java, Indonesia.

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