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The Chemistry of Formation of Some Secondary Arsenate Minerals of Cu(II), Zn(II) and Pb(II)

Published online by Cambridge University Press:  05 July 2018

M. Clara F. Magalhães ,
Julio D. Pedrosa de Jesus  and
Peter A. Williams
M. Clara F. Magalhães
Affiliation:
Department of Chemistry, University of Aveiro, Aveiro, Portugal
Julio D. Pedrosa de Jesus
Affiliation:
Department of Chemistry, University of Aveiro, Aveiro, Portugal
Peter A. Williams
Affiliation:
Department of Chemistry, University College, PO Box 78, Cardiff, Wales, CF1 1XL
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Abstract

Solution studies have been carried out on natural and synthetic arsenate minerals, which are often found in the oxide zones of base metal orebodies. Solubility products and free energy of formation data have been derived for the minerals olivenite, cornubite, clinoclase, adamite, legrandite, euchroite, duftite, conichalcite, austinite, bayldonite, and schultenite at 298.2 K (25 °C). The data have been used in turn to construct stability field diagrams illustrating the chemical conditions under which the various species may crystallize from aqueous solution. This equilibrium model is then compared with several natural occurrences of the arsenate suites and it is demonstrated that it can be used to explain a number of observed paragenetic sequences. Descriptions of solution conditions which describe the stabilities of the arsenate minerals with respect to more commonly found secondary minerals of Pb(II), Cu(II), and Zn(II) involve more complex calculations and estimates of the likely levels of various dissolved species, but it is shown how these may be taken into account in the development of a more complex equilibrium model.

Keywords

chemistryformationsecondary mineralsarsenatessolution studiesstability diagrams
Type
Mineralogy
Information
Mineralogical Magazine , Volume 52 , Issue 368 , December 1988 , pp. 679 - 690
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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