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The dispersion phenomena and the influence of temperature on the optic axial angle of Sanidine from the Eifel

Published online by Cambridge University Press:  14 March 2018

K. Kôzu
K. Kôzu*
Affiliation:
Tôhoku Imperial University, Sendai, Japan
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Extract

In the course of my study of the dispersion phenomena of the felspar group in the Mineralogical Laboratory of the University of Cambridge, Professor Lewis advised me to study the remarkable properties of sanidine from the Eifel, which were first noticed by Des Cloizeaux, and he very kindly placed the mineral sections in the Museum at my disposal. In order to be certain of the material used, application was made to Professor A. Lacroix of Paris, who with the courtesy and generosity characteristic of his countrymen was good enough to send some fragments of the very crystals used by Des Cloizeanx in his classical researches.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 17 , Issue 82 , April 1916 , pp. 237 - 252
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1916

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References

page 238 note 1 Kôzu, S., 'The dispersion phenomena of albite from Alp Rischuna, Switzerland.' Mineralogical Magazine, 1915, vol. xvii, pp. 189–192 CrossRefGoogle Scholar.

page 238 note 1 For comparison are given below the refractive indices of the sanidine from Wehr, Eifel, determined by A. Mülheims (Zeits. Kryst. Min., 1888, vol. xiv, p. 235):-

page 239 note 1 Hutchinson, A., 'A universal goniometer.' Mineralogical Magazine, 1911, vol. xvi, pp. 100–108 CrossRefGoogle Scholar.

page 240 note 1 Readers interested in the problem Of the dispersion of the elasticity-axes will find a theorotieal explanation in Nakamura, S., 'Über die Dispersion der optisehen Symmetrieaehse im durehsiehtigen inaktiven monoklinisehen Krystall.' Physik. Zeits., 1905, vol. vi, pp. 172–174 Google Scholar.

page 241 note 1 Hutchinson, A. and Tutton, A. E. H., 'On the temperature of optical uniaxiality in gypsum.' Mineralogical Magazine, 1912, vol. xvi, pp. 257–263 CrossRefGoogle Scholar.

page 242 note 1 F. Pockels, 'Lehrbueh der Kristalloptik,' 1906, p. 454.

page 247 note 1 F. Pockels, loc. cit., p. 71.

page 248 note 1 For 𝛌=671μμ, 𝜸 = 1·52255 and β= 1·52248.