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The lattice parameters of high-temperature triclinic sodic feldspars

Published online by Cambridge University Press:  14 March 2018

I. S. E. Carmichael  and
W. S. MacKenzie
I. S. E. Carmichael
Affiliation:
Department of Geology, Imperial College of Science London, S.W. 7
W. S. MacKenzie
Affiliation:
Department of Geology, The University, Manchester, 13
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Summary

The lattice parameters of twenty calcium-bearing anorthoclases and potassium-bearing acid plagioclases have been determined by powder methods. The 201̄ spacing of the homogenized anorthoclases gives a good measure of the Or content irrespective of the amount of calcium present ; this spacing combined with α* (010): (001) may be used to determine the ternary composition of homogeneous feldspars more potassic than approximately Or15. The lattice parameters of feldspars less potassic than Or15 cannot be used for the determination of their ternary composition.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 33 , Issue 266 , September 1964 , pp. 949 - 962
Copyright
Copyright © 1964, The Mineralogical Society

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