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The descloizite-mottramite series of vanadates from the Otavi Mountain Land, South West Africa: an X-ray study

Published online by Cambridge University Press:  05 July 2018

W. A. van der Westhuizen ,
H. de Bruiyn ,
E. A. W. Tordiffe  and
B. J. V. Botha
W. A. van der Westhuizen
Affiliation:
Department of Geology, University of the Orange Free State, PO Box 339, Bloemfontein, South Africa
H. de Bruiyn
Affiliation:
Department of Geology, University of the Orange Free State, PO Box 339, Bloemfontein, South Africa
E. A. W. Tordiffe
Affiliation:
Department of Geology, University of the Orange Free State, PO Box 339, Bloemfontein, South Africa
B. J. V. Botha
Affiliation:
Department of Geology, University of the Orange Free State, PO Box 339, Bloemfontein, South Africa
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Abstract

Descloizite, cuprian descloizite, and mottramite from most of the known prospects and mines in the Otavi Mountain Land were sampled and subsequently analysed chemically and by X-ray diffraction. Unit cell parameters were refined with the aid of a computer program. It was found that, contrary to previous opinion, chemical parameters of these vanadates can be deduced from their X-ray powder data according to the equations (correlation coefficients in parenthesis):

ZnO = 75.369c−0.119b−31.177a−456.512(0.9634)

Zn2+ = 369.568c + 236.583b − 146.42a − 3726.344 (0.9642)

CuO = − 74.991c + 0.086b + 29.419a + 486.204 (0.9649)

Cu2+ = − 369.568c − 236.583b + 146.420c + 3826.344 (0.9642).

Keywords

descloizitemottramiteX-ray dataOtavi Mountain LandSouth West Africa
Type
Mineralogy
Information
Mineralogical Magazine , Volume 50 , Issue 355 , March 1986 , pp. 137 - 140
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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