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IV.—On the Pressure Cavities in Topaz, Beryl, and Diamond, and their bearing on Geological Theories.

Published online by Cambridge University Press:  17 January 2013

David Brewster
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Extract

In the years 1823 and 1826 I communicated to this Society two papers “On the Existence of Two New Fluids in the Cavities of Precious Stones and other Minerals.” These two fluids were generally found together in the same cavity, though sometimes the cavities were occupied only by one of them. They were perfectly transparent and immiscible. The denser of the two occupied the angles of the cavities, or the necks, or narrow passages, or canals which united two or more larger cavities; while the rarer fluid floated, as it were, on the other in deep cavities, or filled the body of shallower ones, with the exception of a circular vacuity, which diminished and disappeared with the slightest increase of temperature, or enlarged itself and disappeared in consequence of the fluid being converted into vapour.

Type
Transactions
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 23 , Issue 1 , 1862 , pp. 39 - 44
Copyright
Copyright © Royal Society of Edinburgh 1862

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References

page 39 note * The American and French mineralogists have given the name of Brewstoline to the volatile, and Cryptoline to the dense fluid.

page 40 note * See Edinburgh Transactions, vol. x. p. 21, note, and plate i. fig. 10, plate ii. figs. 20, 21; p. 419, note, and plate xix. fig. 4.

page 41 note * In 1820 I discovered similar cavities in amber, &c. See Edin. Phil. Journal, vol. ii. p. 334.

page 41 note † See Edin. Trans. 1815, vol. viii. p. 157; or Journal de Physique, 1816, vol. lxxxii. p. 367.

page 42 note * Edinburgh Philosophical Journal, vol. ii. p. 334, 1820.

page 43 note * Philosophical Transactions, 1822, p. 367.

page 44 note * Daubrée, “Etudes sur le Metamorphisme,” 1860, p. 36.

page 44 note † Comptes Rendus, &c., tom. li. p. 42, tom. liii. pp. 83, 610; and Fournet, “Geologie Lyonnaise,” Lyons, 1861, pp. 533, 715.

page 44 note ‡ Comptes Rendus, &c., 15th July 1861, tom liii. p. 83, note.

page 44 note § Geologie Lyonnaise, p. 536.