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The mineralogy of the potassium-barium feldspar series III: Subsolidus relationships

Published online by Cambridge University Press:  14 March 2018

P. Gay  and
N. N. Roy
P. Gay
Affiliation:
Department of Mineralogy and Petrology, Cambridge
N. N. Roy
Affiliation:
Department of Mineralogy and Petrology, Cambridge
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Summary

Further data are presented on the properties of natural and synthetic members of this series. Cell constants have been determined for over 50 specimens across the composition range; the activation energy for a low-high transformation in an intermediate hyalophane has been evaluated as 101·5 ± 5·0 kcal/mole; additional single crystal studies have revealed complexities not previously reported.

Although there remain many detailed problems to be resolved, the present studies allow some suggestions concerning the nature of the relationships within the series. Problems of nomenclature and subsolidus relations are discussed together with some structural implications.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 36 , Issue 283 , September 1968 , pp. 914 - 932
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1968

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