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Determination of the optic axes and 2V: electronic computation from extinction data

Published online by Cambridge University Press:  14 March 2018

N. Joel
N. Joel*
Affiliation:
Instituto de Física y Matemáticas, Universidad de Chile, Casilla 2777, Santiago, Chile1
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Summary

Extinction readings are taken, on a polarizing microscope, for several wave-fronts in a biaxial crystal (more than four wave-fronts are required). With these extinction data, the machine then calculates the directions of the two optic axes and of the three principal axes of the indicatrix, as well as the value of the optic axial angle 2V, using a least-squares successive approximation technique. The programme was written for an IBM 1620 computer.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 35 , Issue 270 , June 1965 , pp. 412 - 417
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1965

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References

Joel, (N.), 1963a. Min. Mag., vol. 33, pp. 679–692.Google Scholar
Joel, (N.), 1963b. Bull. Soc. franc. Min. Crist., vol. 86, pp. 405–408.Google Scholar
Joel, (N.), 1964. Min. Mag., vol. 33, pp. 769–779.Google Scholar
Joel, (N.) and Garaycochea, (I.), 1957. Acta Cryst., vol. 10, pp. 399–406.Google Scholar
Joel, (N.) and Muir, (I. D.), 1958a. Min. Mag., vol. 31, pp. 860–877.Google Scholar
Joel, (N.), 1958b. Ibid., pp. 878–882.Google Scholar
Joel, (N.) and Tocher, (F. E.), 1964. Ibid., vol. 33, pp. 853–867.Google Scholar
Toocher, (F. E.), 1964a. Ibid., pp. 780–789.Google Scholar
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Toocher, (F. E.), 1964c. Amer. Min., vol. 49, pp. 1622–1630.Google Scholar
Toocher, (F. E.), 1965. The universal stage and 2V: a new extinction technique of high accuracy (in preparation).Google Scholar