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On a Black Sand from South-East Iceland

Published online by Cambridge University Press:  01 May 2009

Alan Stuart
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Extract

So far as the writer is aware, no sodic or “contaminated” rocks have been recorded from Iceland, and it was thought that an examination of some black sand collected by Dr. L. Hawkes, and kindly supplied by him, might reveal the presence of minerals from such rocks.

Type
Original Articles
Information
Geological Magazine , Volume 64 , Issue 12 , December 1927 , pp. 540 - 545
Copyright
Copyright © Cambridge University Press 1927

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References

page 542 note 1 Brush, G. J. and Penfield, S. L., Determinative Mineralogy, 16th ed., 1907, p. 127.Google Scholar

page 542 note 2 Holmes, A., “The basaltic rocks of the Arctic region”: Min. Mag., vol. xviii, p. 180.Google Scholar

page 542 note 3 Penfield, S. L. and Forbes, E. H., “Fayalite from Rockfort, Mass., and on the optical properties of the Chrysolite-Fayalite Group and of Monticellite [Hortonolite]”: Amer. Journ. Sci., ser. iv, i, p. 129 (1896).CrossRefGoogle Scholar

page 543 note 1 Tilley, C. E., “Density, refractivity, and composition relations of some natural glasses”: Min. Mag., vol. xix, pp. 275–94.Google Scholar

page 543 note 2 Made as described in Johannsen, A., Manual of Petrographic Methods, 1918, p. 455, and Journ. of Geol., xxi, 1913, p. 96.Google Scholar

page 543 note 3 Judd, J. W., “Composite dykes in Arran”: Q.J.G.S., vol. xlix, 1893, pp. 549–50.Google Scholar

page 544 note 1 J. W. Judd, op. cit., p. 550, footnote.

page 544 note 2 The greatest source of error. But the figures given express the composition more truly than is possible with the usual method of denoting frequencies by numbers from 1 to 10.