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Clouded felspars and thermal metamorphism

Published online by Cambridge University Press:  14 March 2018

A. G. MacGregor
A. G. MacGregor*
Affiliation:
Geological Survey of Scotland
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Extract

The present paper summarizes the facts at present known regarding a characteristic effect that is often produced in the fresh plagioclase felspars of igneous rocks by thermal metamorphism—namely the development of a special type of cloudiness caused by the appearance of minute inclusions. Reference is also made to certain wel|-known rocks in which the clouding of plagioclase felspars has been described without any suggestion that the peculiarity of the felspars is connected with thermal metamorphism.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 22 , Issue 133 , June 1931 , pp. 524 - 538
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1931

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