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Olivine composition determination with small-diameter X-ray powder cameras1

Published online by Cambridge University Press:  14 March 2018

J. L. Jambor  and
Charles H. Smith
J. L. Jambor
Affiliation:
Geological Survey of Canada, Ottawa
Charles H. Smith
Affiliation:
Geological Survey of Canada, Ottawa
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Summary

Olivine composition can be rapidly and accurately obtained by using standard (Straumanis-mounting) 57·3 mm X-ray powder cameras. A determinative curve based on analysed natural olivines has been constructed by plotting the mol. % Fo against the spacing of back-reflection line 174. The regression equation for the composition range Fo100 to Fo30 is

Fo (mol. %) = 4151·46−3976·45 d174

using Fe-Kα1 radiation. The fayalite end (Fo30 to Fo0) of the determinative curve shows a relatively sharp break from a straight-line relationship of d-spacing versus composition. Practical applications of the determinative curve are briefly presented.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 33 , Issue 264 , March 1964 , pp. 730 - 741
Copyright
Copyright © 1964, The Mineralogical Society

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Footnotes

1

Canadian Contribution No. 3 to the International Upper Mantle Project.

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