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EXAFS and Mössbauer spectroscopic study of Febearing tetrahedrites

Published online by Cambridge University Press:  05 July 2018

J. M. Charnock ,
C. D. Garner ,
R. A. D. Pattrick  and
D. J. Vaughan
J. M. Charnock
Affiliation:
Department of Chemistry, The University, Manchester M13 9PL
C. D. Garner
Affiliation:
Department of Chemistry, The University, Manchester M13 9PL
R. A. D. Pattrick
Affiliation:
Department of Geology, The University, Manchester M13 9PL
D. J. Vaughan
Affiliation:
Department of Geology, The University, Manchester M13 9PL
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Abstract

EXAFS and Mössbauer data on synthetic silver-rich tetrahedrite, (Cu, Ag)10+xFe2−xSb4S13, reveal the presence of Fe2+ and Fe3+ the former occupying trigonal planar sites and the latter tetrahedral sites. There is also a clear relationship between increased silver substitution and an increase in Fe2+. The amount of Fe3+ incorporated in the synthetic tetrahedrites is proportional to the excess of Cu+ (Cu + Ag > 10 atoms) in the mineral, thus maintaining a charge balance. The iron in the natural tetrahedrites and the tennantite examined is mainly tetrahedrally co-ordinated Fe2+.

Keywords

EXAFSMössbauerFe-bearingtetrahedrites
Type
Research Article
Information
Mineralogical Magazine , Volume 53 , Issue 370 , April 1989 , pp. 193 - 199
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1989

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