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Cu and Zn ordering in aurichalcite

Published online by Cambridge University Press:  05 July 2018

J. M. Charnock ,
P. F. Schofield ,
C. M. B. Henderson ,
G. Cressey  and
B. A. Cressey
J. M. Charnock
Affiliation:
Department of Earth Sciences, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
P. F. Schofield
Affiliation:
Department of Mineralogy, Natural History Museum, Cromwell Road, London, SW7 5BD, UK
C. M. B. Henderson
Affiliation:
Department of Earth Sciences, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
G. Cressey
Affiliation:
Department of Mineralogy, Natural History Museum, Cromwell Road, London, SW7 5BD, UK
B. A. Cressey
Affiliation:
Department of Geology, University of Southampton, Southampton Oceanography Centre, Southampton, SO14 3ZH, UK
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Abstract

The advantages of X-ray absorption spectroscopy have been utilized to assess the Cu and Zn ordering in aurichalcite, (Cu5−xZnx)(OH)6(CO3)2. We have examined one hydrozincite sample and three aurichalcite samples in which the Cu:Zn ratios are in the range 1:3 to 2:3. Copper 2p XAS confirms that there is no monovalent copper in aurichalcite and that in each sample the copper might be distributed across more than one metal site. EXAFS, at the Cu and Zn K-edges, shows that the copper atoms preferentially enter the Jahn-Teller elongated, octahedral (M2) and trigonal bipyramidal (M4) sites, with the zinc atoms entering the more regular octahedral (M1) and tetrahedral (M3) site. Substantial solid solution towards the zinc rich region is facilitated by the substitution of copper by zinc on the M2 and M4 sites. This information, not easily obtained by X-ray diffraction, substantially enhances the understanding of the structure of aurichalcite.

Keywords

aurichalcitehydrozinciteCu and Zn orderingEXAFS
Type
Mineralogy
Information
Mineralogical Magazine , Volume 60 , Issue 403 , December 1996 , pp. 887 - 896
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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