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Studies of mineral sulpho-salts: XIII—Polybasite and pearceite1

Published online by Cambridge University Press:  14 March 2018

M. A. Peacock  and
L. G. Berry
M. A. Peacock
Affiliation:
University of Toronto
L. G. Berry
Affiliation:
Queen's University, Kingston, Ontario
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Extract

These two minerals are analogous silver compounds with similar pseudo-hexagonal monoclinic form and similar compositions: polybasite, 8(Ag,Cu)2.(Sb,As)2S3, and pearceite, 8(Ag,Cu)2S.As2S3. Cu replaces Ag in considerable and varying amounts in both minerals, and in polybasite there may also be substantial replacement of Sb by As. However, the rather numerous existing analyses do not indicate continuous chemical variation from arsenian polybasite to pearceite, and therefore it is proper to recognize the two minerals as distinct species rather than end-members of a series.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 28 , Issue 196 , March 1947 , pp. 1 - 13
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1947

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Footnotes

1

For the preceding paper of this series see E. W. Nuffield (1946) [M.A. 10–15]. No. II by L. G. Berry on jamesonite appeared in this Magazine, 1940, vol. 25, pp. 597–608.

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