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Ferrian chlorospinel from Carneal, Co. Antrim

Published online by Cambridge University Press:  14 March 2018

P. A. Sabine
Affiliation:
Institute of Geological Sciences, London S.W. 7
G. A. Sergeant
Affiliation:
Institute of Geological Sciences, London S.W. 7
B. R. Young
Affiliation:
Institute of Geological Sciences, London S.W. 7

Summary

A Tertiary dolerite plug at Carneal, Co. Antrim has been contaminated by Chalk with the production of calc-silicates and related minerals. In a larnite-spinel-rock the spinel is of the unusual ferrian variety. It has the composition The spinel, which is brown, has: n, 1·862; D, 3·97; a, 8·1905 Å. A chemical analysis and powder data are given, the implications of experimental data are briefly discussed, and the nomenclature is reviewed.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1968

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