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Published online by Cambridge University Press: 17 January 2013
The existence of certain minerals imbedded in others,—the optical phenomena which they exhibit,—their form and mode of distribution, and the mechanical influence which has been exerted during their formation on the mineral that contains them, are among the most curious and instructive facts in physical science.
The dissemination of perfectly-formed crystals of titanium, both in the form of titanite and anatase, in Brazilian crystals of quartz, is a fact so well known that I shall take no farther notice of it, but shall proceed to give an account of a series of facts of a much more general and interesting character, which I have had occasion to observe, during an extensive examination of minerals, undertaken with a different object.
page 549 note * A fluid even may have thus escaped, and the circular hollow remained as before. In support of this opinion, see Edinburgh Transactions, vol. x., p. 11; but especially vol. xvi., p. 13; or Phil. Mag., vol. xxxi., p. 101, August 1847Google Scholar.
page 550 note * See Comptes Rendus, tom. v., p. 822, 1837. Dec. 11.
page 552 note * See Edinburgh Transactions, 1826, vol. x., Plate XXGoogle Scholar.
page 552 note † See Phil. Trans., 1815, Plate XV., Fig. 2.