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Lithium–aluminium micas from the Meldon aplite, Devonshire, England

Published online by Cambridge University Press:  05 July 2018

M. Nawaz Chaudhry  and
R. A. Howie
M. Nawaz Chaudhry
Affiliation:
Department of Geology, King's College, University of London
R. A. Howie
Affiliation:
Department of Geology, King's College, University of London
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Summary

Chemical analyses of sixteen lithium-aluminium micas are presented along with their optical, physical, and X-ray data. Compositional variation, substitution relations in structural positions, and octahedral occupancy are discussed. The 2M2 structural types are found to crystallize in volatilerich low-temperature environments whereas the 1M polytypes occur in comparatively volatile-poor and higher-temperature environments. Variation diagrams have been constructed to show the relationship between octahedral sites occupied by and refractive indices and specific gravities.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 303 , September 1973 , pp. 289 - 296
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1973

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Footnotes

1

Present address: Department of Geology, University of the Panjab, Lahore, Pakistan.

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