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Conical extinction curves: a new universal stage technique1

Published online by Cambridge University Press:  14 March 2018

N. Joel  and
F. E. Tocher
N. Joel
Affiliation:
Centro de Investigaciones de Cristalografía, Instituto de Física y Matemáticas, Universidad de Chile, Casilla 2777, Santiago, Chile
F. E. Tocher
Affiliation:
Dept. of Geology and Mineralogy, University of Aberdeen, Aberdeen, Scotland
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Summary

New generalized extinction curves, derived from wave-normals located on a circular cone, are presented. They may be used with the universal stage for the accurate location of up to all three of the indicatrix axes, α, β, γ, of any biaxial crystal, or the optic axis of any uniaxial crystal.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 33 , Issue 265 , June 1964 , pp. 853 - 867
Copyright
Copyright © 1964, The Mineralogical Society

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Footnotes

1

This technique was evolved independently and almost simultaneously by the two authors who have agreed on a joint presentation.

References

Garaycochea, (I,) and Wittke, (O.), 1964.Acta Cryst., vol. 17, p. 183.CrossRefGoogle Scholar
Joel, (N.), 1950.Min. Mag., vol. 29, p. 206.Google Scholar
Joel, (N.), 1951. Ibid., p. 602.CrossRefGoogle Scholar
Joel, (N.), 1963.Ibid., vol. 33, p. 679.Google Scholar
Joel, (N.), and Garau, (I.), 1957.Acta Cryst., vol. 10, p. 399.CrossRefGoogle Scholar
Joel, (N.), and Muir, (I.D.), 1958.Min. Mag., vol. 31, p. 860.Google Scholar
Tocher, (F.E.), 1962.Ibid., vol. 33, p. 52.Google Scholar
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Wilcox, (R.E.), 1960.Bull. Geol. Soc. Amer., vol. 71, p. 2003.Google Scholar