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Stability relations of malachite and azurite

Published online by Cambridge University Press:  05 July 2018

B. W. Vink*
Affiliation:
University of Botswana, Private Bag 0022, Gaborone, Botswana

Abstract

Stability relations of malachite and azurite are calculated and shown in Eh-pH diagrams, using ΔF (Gibbs free energy) values listed in Garrels and Christ (1965). The malachite/azurite transition is very sensitive to small chemical changes in the environment: equilibrium is reached at PCO2 = 10−3.45 atm., i.e. close to normal values, whereas the precipitation of both minerals from cupric-ion-bearing solutions takes place at pH values between 6 and 8, depending CO2 partial pressures. It is shown that stability relations of these minerals can be better explained in terms of activities of the carbonate and bicarbonate ion.

Azurite can be formed only under relatively acid conditions at relatively high carbonate activities. Since the latter imply mostly basic conditions, this explains why malachite is the more common form of copper carbonate and that azurite can be formed only under rather unusual conditions. It also explains the frequent alteration of azurite into malachite, due to small changes in carbonate/bicarbonate activities. These alterations include pseudomorphs of malachite after azurite.

Type
Mineral Chemistry
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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References

Garrels, R.M., and Christ, C.L. (1965) Solutions, minerals and equilibria. Freeman, Cooper and Company, San Francisco.Google Scholar
Kern, R., and Weisbrod, A. (1967) Thermodynamics for geologists. Freeman, Cooper and Company, San Francisco.Google Scholar