Hostname: page-component-78c5997874-fbnjt Total loading time: 0 Render date: 2024-11-02T20:21:06.558Z Has data issue: false hasContentIssue false
  • English
  • Français

The effects of heat on the optical orientation of plagioclase felspars

Published online by Cambridge University Press:  14 March 2018

C. T. Barber
Get access Rights & Permissions [Opens in a new window]

Extract

Aconspicuous feature of all published diagrams, showing the results of the determination of a number of plagioclase felspars by the Fedorov method, is the pronounced scattering of the poles. They lie not only on the curves of the determinative stereogram, but on either side of them, and, in fact, occupy a belt, varying in different instances, and in different positions along the length of the same curve, from 3 to 8 mm. in width. These belts usually contain, but are not symmetrically disposed to, the curves.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 24 , Issue 154 , September 1936 , pp. 343 - 352
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1936

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

page 343 note 1 Reinhard, M., Universal Drehtischmethoden. Basel, 1931, plate II.Google Scholar [M.A. 4-435.]

page 343 note 2 M. Reinhard, loc. cit., pp. 105-112.

page 343 note 3 Spaenhauer, F., Über das Ergebnis von Messungen an synthetischen Plagioklasen mit Hilfe des Universaldrehtisches. Schweiz. Min. Petr. Mitt., 1933, vol. 13, pp. 356-365.Google Scholar [M.A. 5-437.]

page 343 note 4 Manolescu, G., Über die Lage der morphologischen Bezugsrichtungen bei Plagioklasen und ihre Verwendbarkeit zur Bestimmung des Anorthitgehaltes. Ibid., 1934, vol. 14, pp, 452-463.Google Scholar

page 343 note 5 Barber, C. T., Mem. Geol. Surv. India, 1936, vol. 68, pp. 121-292.Google Scholar

page 344 note 1 Barth, T. W. F., Permanent changes in the optical orientation of feldspars exposed to heat. Norsk Geol. Tidsskrift, 1931, vol. 12, pp. 57-72.Google Scholar [M.A. 5-218.]

page 344 note 2 Lewis, W. J., On crystals of albite from Alp Rischuna, and perieline twins from Fibbia, Switzerland. Min. Mag., 1915, vol. 17, pp. 178-188;CrossRefGoogle Scholar and S. Kôzu. The dispersion phenomena of albite from Alp Rischuna, Switzerland. Ibid., pp. 189-192.

page 344 note 3 Lacroix, A., Minéralogie de la France. Paris, 1896, vol. 2, pp. 180-182.Google Scholar (analysis, p. 177).

page 344 note 4 Campbell Smith, W., The optical orientation of labradorite from County Down (Ireland) determined by the Fedorov method. Min. Mag., 1928, vol. 21, pp. 543-551.CrossRefGoogle Scholar

page 344 note 5 Makino, K., Anorthite crystals from Otaru in Hokkaidō. Beitr. Min. Japan, 1915, no. 5, pp. 287-288.Google Scholar [M.A. 1-136.]

page 346 note 1 C. T. Barber, loc. cit., pp. 238-241.

page 351 note 1 Spencer, E., A contribution to the study of moonstone from Ceylon and other areas and of the stability-relations of the alkali-felspars. Min. Mag., 1930, vol. 22, p. 346.CrossRefGoogle Scholar