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Density, refractivity, and composition relations of some natural glasses

Published online by Cambridge University Press:  14 March 2018

C. E. Tilley
C. E. Tilley*
Affiliation:
Emmanuel College, Cambridge
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Extract

Whilst some atention has in the past been devoted to the question of the properties of natural glasses, very little has been done to indicate the interrelations of the properties determined. In the case of tile natural volcanic glasses, this is unfortullately only too evident from a study of the standard text-books. A determination of such properties as density, refractivity, ttud chemical composition, and the interrelations of these for particular glasses, is rarely to be found in the literature. The chief contribution to this subject is due to Stark, who has examined the refringence of a large number of volcanic glasses. Unfortunately, there is no record of the density of these rocks, and the interrelation of these remained unknown.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 19 , Issue 96 , March 1922 , pp. 275 - 294
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1922

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References

page 275 note 1 Stark, M., Tschermaks Min. Petr. Mitt., 1904, vol. 28, p. 536 Google Scholar.

page 276 note 1 Suess, F. E., Mitt. Geol. Gesell. Wien, 1914, vol. 7, pp. 51–121, 3 plsGoogle Scholar.

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page 278 note 1 J. B. Scrivenor (Geol. Mag., 1909, p. 411) has given specific gravity determinations of obsidianites from this locality.

page 280 note 1 Omitting the anomalous Newry pitehstone, the mean becomes 0·2060.

page 281 note 1 Summers, H. S., Proc. Roy. Soc. Victoria, 1909, vol. 21, pp. 423–443 Google Scholar.

page 285 note 1 Tesch, P., Proc. Sci. K. Akad. Wetens. Amsterdam, 1903, vol. 5, pp. 602–605 Google Scholar.

page 285 note 2 Washington, H. S., Amer. Journ. Sci., 1920, vol. 50, p. 449 Google Scholar.

page 287 note 1 Day, A. L. and Shepherd, E. S., Ann. Rep. Smithson. Inst., 1918, p. 286 Google Scholar.

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page 287 note 4 Cole, G. A. J., ibid., 1888, vol. 44, p. 803 Google Scholar.

page 287 note 5 Harker, A., Tertiary Igneous Rocks of Skye, Mem. Geol. Survey, Great Britain, 1904, p. 342 Google Scholar.

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page 288 note 1 Washington, H. S., Amer. Journ. Sci., 1920, vol. 50, p. 458 Google Scholar.

page 288 note 2 Day, A. L. and Shepherd, E. S., Ann. Rep. Smithson. Inst., 1913, p. 286 Google Scholar.

page 289 note 1 The K value for orthoelase using the specific gravity of the St. Gotthard adulsria is 0·2035, in which ease substituted here would reduce these values to 0·2067 and 0·2082 respectively without affecting the values for the basic glasses.

page 290 note 1 H. S. Washington, loc. cit., p. 462.

page 290 note 1 Two slightly different relations to that expressed in equation (6), are derived by C. Pulfrieh (Zeits. phys. Chem., 1889, vol. 4, pp. 561-569), and F. Schutt (Zeits. phys. Chem., 1892, vol. 9, pp. 349-377), in which the specific refractivities are considered as not being strictly additive.

page 290 note 2 Holmes, J., Trans. Chem. Soc., 1915, vol. 107, p. 1471 CrossRefGoogle Scholar.

page 290 note 3 Iddings, J. P., Amer. Journ. Sci., 1920, vol. 49, pp. 863–366 Google Scholar.