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Corkite from Aggeneys, Bushmanland, South Africa

Published online by Cambridge University Press:  05 July 2018

H. de Bruiyn ,
W. A. Van Der Westhuizen ,
G. J. Beukes  and
T. Q. Meyer
H. de Bruiyn
Affiliation:
Department of Geology, University of the Orange Free State, PO Box 339, Bloemfontein 9300, South Africa
W. A. Van Der Westhuizen
Affiliation:
Department of Geology, University of the Orange Free State, PO Box 339, Bloemfontein 9300, South Africa
G. J. Beukes
Affiliation:
Department of Geology, University of the Orange Free State, PO Box 339, Bloemfontein 9300, South Africa
T. Q. Meyer
Affiliation:
Department of Geology, University of the Orange Free State, PO Box 339, Bloemfontein 9300, South Africa
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Abstract

Corkite associated with plumbojarosite and goethite occurs in gossan and iron-formation at Black Mountain and Broken Hill, Aggeneys. Electron microprobe analyses indicate that there are two groups of corkite present in the area; one with high Cu and low (PO4)3− and the other with low Cu and high (PO and the other with low Cu and high (PO4)3− contents. This can be explained in terms of the general formula contents. This can be explained in terms of the general formula AB2(XO4)2(OH)6, where the incorporation of divalent ions in the B site is accompanied by the exchange of trivalent anions by divalent ones to retain charge balance. Complete solid-solution is inferred between (SO4)2−and (PO4)3− end members, indicating that the jarosite and beudantite groups form part of the same solid-solution series. The distribution of Zn in corkite also reflects the regional distribution of zinc grades in the area, becoming more zinc-rich from west to east. New X-ray diffraction parameters are also presented which update existing data.

Keywords

corkiteEMP analysessolid-solution seriesX-ray diffraction dataBushmanlandSouth Africa
Type
Mineralogy and Petrology
Information
Mineralogical Magazine , Volume 54 , Issue 377 , December 1990 , pp. 603 - 608
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1990

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