Hostname: page-component-cd9895bd7-jkksz Total loading time: 0 Render date: 2025-01-06T01:23:46.467Z Has data issue: false hasContentIssue false
  • English
  • Français

Determination of 2V from one extinction curve and its related n0 curve

Published online by Cambridge University Press:  14 March 2018

N. Joel
N. Joel*
Affiliation:
Centro de Investigaciones de Cristalografía, Instituto de Física y Matemáticas, Universidad de Chile, Casilla 2777, Santiago, Chile
Get access Rights & Permissions [Opens in a new window]

Summary

From the extinction curve of a biaxial crystal mounted on a spindle stage (or one-axis stage goniometer), the related n0 curve can be derived and drawn on the stereogram. The n0 curve is the equivibration curve—or constant-refractive-index curve—that goes through the projection P0 of the spindle-stage axis. After the principal diameters (maximum 2η and minimum 2ζ) of the no curve have been measured, the angle 2V may be calculated by means of the formula cos V = sin ζ/sin η. This method can also be used for determining—or refining—the directions of the principal axes α, β, γ.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 33 , Issue 263 , December 1963 , pp. 679 - 692
Copyright
Copyright © 1963, The Mineralogical Society

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Fisher, (D.J.), 1962. Amer. Min., vol. 47, p. 649.Google Scholar
Garau, (I.) and Wittke, (O.), 1963. Acta Cryst. (In press.)Google Scholar
Joel, (N.), 1950. Min. Mag., vol. 29, p. 206.Google Scholar
Joel, (N.), 1951. Ibid., vol. 29, 10. 602.Google Scholar
Joel, (N.), and Garaycoctiea, (I.), 1957. Acta Cryst., vol. 10, p. 399.Google Scholar
Joel, (N.), and Mura, (I.D.), 1958. Min. Mag., vol. 31, 10-860.Google Scholar
Joel, (N.), 1958. Ibid., 10. 878.Google Scholar
Joel, (N.), 1964. Ibid., vol. 33, no. 264 (in press).Google Scholar
Mvir, (I.D.) and Joel, (N.), 1964. (In preparation).Google Scholar
Palache, (C.), Berman, (H.), and Frondel, (C.), 1951. Dana's System of Mineralogy, 7th ed., vol. 2.Google Scholar
Phemister, (T.C.), 1954. Amer. Min., vol. 39, p. 172.Google Scholar
Tother, (F.E.), 1962. Min. Mag., vol. 33, p. 52.Google Scholar
Villarroel, (H.) and JO]∼L, (N.), 1964. (In preparation).Google Scholar
Wilcox, (R.E.), 1959. Amer. Min., vol. 44, p. 1272.Google Scholar
Wilcox, (R.E.), 1960. Bull. Geol. Soc. Amer., vol. 71, p. 2003.Google Scholar
Wilson, (E.B.), 1943. Vector Analysis. I∼ew Haven (Yale University Press).Google Scholar
Wittke, (O.), 1962. Personal communication.Google Scholar
Wright, (F.E.), 1923. Journ. Opt. Soc. Amer., vol. 7, p. 779.Google Scholar