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The origin of accessory garnet in the Donegal Granite

Published online by Cambridge University Press:  14 March 2018

Anthony Hall
Affiliation:
Geology Department, King's College, London WC. 2

Summary

In the Donegal Granite garnet occurs as an accessory mineral in muscovite-granties, pegmatites, and aplites. The composition of the garnet in fourteen samples of granitic rock has been determined from the physical properties and three new chemical analyses are given. All the samples examined are intermediate in composition between almandine and spessartine. The reason for the high manganese content in garnet from granites is discussed.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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