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The beryls of the Rosses district, Donegal

Published online by Cambridge University Press:  05 July 2018

A. Hall  and
J. N. Walsh
A. Hall
Affiliation:
Department of Geology, King's College, Strand, London, WC2R 2LS
J. N. Walsh
Affiliation:
Department of Geology, King's College, Strand, London, WC2R 2LS
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Summary

Chemical analyses and physical properties are given for six samples of beryl from greisenized granites, pegmatites, and beryl-quartz veins in the Rosses granite complex. The beryls studied were all very similar in composition and contain significant amounts of alkali elements and water in addition to the constituents represented by the formula Be3Al2Si6O18. Calculation of the empirical unit cell contents indicates that most of the H2O+ is present in the mineral as water molecules. The effects of these extra constituents on the physical properties are discussed, and it is suggested that the variation in refractive indices displayed by beryl is to a large extent attributable to the variable water content.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 295 , September 1971 , pp. 328 - 334
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1971

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