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Al-Cr substitution in peraluminous sapphirines from the Bjørnesund area, Fiskenaesset region, southern West Greenland

Published online by Cambridge University Press:  05 July 2018

C. R. L. Friend
C. R. L. Friend*
Affiliation:
Department of Geology and Physical Sciences, Oxford Polytechnic, Headington, Oxford, OX3 0BP
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Abstract

Cr-rich Mg-sapphirines, which are more aluminous in composition than R2+:R3+:Si of 7:9:3 and are therefore considered to be peraluminous, are shown to have an inverse linear relationship between octahedrally co-ordinated Cr and Al. This balanced substitution, which has not previously been described, may be used to explain the major chemical variations exhibited in the described minerals. Since the peraluminous Cr-rich sapphirines are idioblastic it is suggested that they are stable members of the assemblages within which they occur. Peraluminous sapphirine is usually considered to be metastable but in this instance it is possible that chromium may assist in stabilizing its development.

Type
Research Article
Information
Mineralogical Magazine , Volume 46 , Issue 340 , September 1982 , pp. 323 - 328
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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