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Electrostatic energy for ion clustering in intermediate plagioclase feldspar

Published online by Cambridge University Press:  05 July 2018

Joseph R. Smyth  and
Joseph V. Smith
Joseph R. Smyth
Affiliation:
Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois 60637, U.S.A.
Joseph V. Smith
Affiliation:
Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois 60637, U.S.A.
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Summary

Electrostatic calculations estimated the energy of hypothetical ion clustering in intermediate plagioclase feldspars. The calculated energy appears too great to allow segregation of Ca and Na atoms into domains upon annealing without a corresponding movement of Al and Si from an original disordered structure. The calculated energy may be sufficiently small that Ca and Na atoms can disorder partially without movement of Al and Si upon heating a low-plagioclase to high temperatures.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 286 , June 1969 , pp. 181 - 184
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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