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The cummingtonite problem

Published online by Cambridge University Press:  14 March 2018

W. Layton  and
R. Phillips
W. Layton
Affiliation:
Department of Geology, Durham Colleges in the University of Durham
R. Phillips
Affiliation:
Department of Geology, Durham Colleges in the University of Durham
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Summary

An examination of available chemical analyses shows that the anthophyllite and cummingtonite series of amphibole minerals are not isodimorphous. Whilst the anthophyllites are truly lime-free amphiboles, small amounts of calcium are essential to stabilize the monoclinic lattice of cummingtonites, which should be regarded as lime-poor amphiboles, analogous to the lime-poor pyroxenes. The existence of synthetic clino-anthophyllites is considered.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 32 , Issue 251 , December 1960 , pp. 659 - 663
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1960

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