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Cummingtonite and gedrite from Sutherland

Published online by Cambridge University Press:  14 March 2018

R. S. Collins
R. S. Collins*
Affiliation:
Department of Geology, Imperial College of Science and Technology, London.
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Extract

During the investigation of a migmatite complex near Strathy, north Sutherland, cummingtonite and gedrite were found to be common constituents of certain schists and granulites. Calcium-poor amphiboles have not hitherto been recorded from rocks of the Moine Series, and it is the purpose of this paper to give the results of the optical and chemical study of three examples of this group. The methods of separation and purification employed are described in some detail as it is considered that many of the previous analyses of these minerals are vitiated by faulty procedure. To avoid errors in separating two amphibole species, the investigated samples were taken from rocks containing a single amphibole phase. The paper concludes with a discussion of the correlation of optical properties and chemical composition of cummingtonites and gedrites.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 26 , Issue 178 , September 1942 , pp. 254 - 259
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1942

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References

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