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Tin-bearing sulphides from St Michael's Mount and Cligga Head, Cornwall

Published online by Cambridge University Press:  05 July 2018

F. Moore  and
R. A. Howie
F. Moore
Affiliation:
Department of Geology, King's College London, Strand, London WC2R 2LS
R. A. Howie
Affiliation:
Department of Geology, King's College London, Strand, London WC2R 2LS
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Abstract

The result of electron probe microanalyses, along with X-ray and optical data obtained for tin sulphides from two different localities in south-west England indicate that the mineral hitherto described from St Michael’s Mount as stannite is in fact kesterite, Cu2(Fe0.23Zn0.77)SnS4. The yellow ‘stannite’ reported from this locality proved to be stannoidite, Cu8(Fe2.39 Zn0.61)SnS2S12. Kesterite, Cu2(Fe0.09Zn0.90SnS4, and zincian stannite, Cu2(Fe0.63Zn0.38)SnS4, are also reported from Cligga Head. It is suggested that a more cautious approach should be taken in identifying these tin sulphides solely on their optical properties.

Type
Research Article
Information
Mineralogical Magazine , Volume 48 , Issue 348 , September 1984 , pp. 389 - 396
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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Footnotes

*

Present address: Department of Geology, College of Arts and Sciences, Shiraz University, Shiraz, Iran.

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