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Irish osumilite

Published online by Cambridge University Press:  05 July 2018

G. A. Chinner  and
P. D. Dixon
G. A. Chinner
Affiliation:
Department of Mineralogy and Petrology, Cambridge University
P. D. Dixon
Affiliation:
Department of Mineralogy and Petrology, Cambridge University
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Summary

Osumilite of composition closely approaching that of the K,Mg end-member occurs as a significant constituent of tridymite-enstatite-feldspar-cordierite-hematite-magnetite buchites at the contact of the Tertiary dolerite plug of Tieveragh, Co. Antrim; it is proposed that the mineral be known as osumilite-(K,Mg). Despite laboratory demonstration of the metastability of osumilite-(K,Mg) over a wide pressure-temperature range, the unaltered character and apparently constant composition of the Tieveragh osumilites raises the possibility of an osumilite stability field within the system K2O-MgO-FeO-Al2O3-SiO2.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 302 , June 1973 , pp. 189 - 192
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1973

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References

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