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Chromian muscovites and epidotes from Outokumpu, Finland

Published online by Cambridge University Press:  05 July 2018

Peter J. Treloar
Peter J. Treloar*
Affiliation:
Department of Geology and Physical Sciences, Oxford Polytechnic, Oxford OX3 0BP
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Abstract

The Outokumpu region of Finland is notable for the large number of Cr-rich silicate and oxide phases associated with the massive sulphide deposits. In this paper analyses of Cr-rich phases in the epidote-clinozoisite and muscovite groups are presented. The muscovite-type phase shows a maximum 80% substitution of Cr for A1 on octahedral sites with a maximum 24.7 wt.% Cr2O3. Apparent complete solid solution between this extreme composition and the fuchsitic muscovites is indicated. The clinozoisite type phase has a maximum 15.4 wt.% Cr2O3, with a composition close to Ca2CrAl2Si3O12(OH). As with the micas, complete solid solution of Cr for Al in the clinozoisite structure is indicated.

Keywords

chromiummuscoviteepidoteclinozoisiteOutokumpuFinland
Type
Mineralogy
Information
Mineralogical Magazine , Volume 51 , Issue 362 , October 1987 , pp. 593 - 599
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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Footnotes

1

Present address: Dept. of Geology, Imperial College, London SW7 2BP.

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