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The determination of composition and thermal history of plagioclase by the X-ray powder method

Published online by Cambridge University Press:  14 March 2018

J. Goodyear  and
W. J. Duffin
J. Goodyear
Affiliation:
Physics Department, University of Hull
W. J. Duffin
Affiliation:
Physics Department, University of Hull
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Abstract

In a recent paper (hereafter referred to as GD) Goodyear and Dufiln (1954) described X-ray powder data for a number of synthetic and chemically analysed plagioclases of composition An0Abl00-Anl00Ab0. Important aspects of this work were a correlation of the X-ray patterns with chemical composition, and a distinction between the pattern of a naturally occurring material of low-temperature origin and that of a synthetic of similar composition. The investigation showed quite clearly that the unit-cell dimensions of a synthetic plagioelase depend but little on composition from An0Abl00 to An70Ab30, whilst they differ from those of the low-temperature modification greatly for albite, to a lessening degree as the composition approaches An70Ab30, and practically not at all in the range An70Ab30-Anl00Ab0.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 30 , Issue 229 , June 1955 , pp. 648 - 656
Copyright
Copyright © 1955, The Mineralogical Society

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References

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