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Published online by Cambridge University Press: 17 January 2013
The following paper contains the results of a series of inquiries, which lead to the conclusion, that the mineral called Smaragdite by Saussure, does not form a species of its own; but that this name has been given to a compound of certain varieties of two distinct species, Augite and Hornblende, the natural-historical species of paratomous and hemiprismatic Augite-spar.
Owing in part to the slight degree of resemblance prevailing among its varieties, the authors who have described them differ so essentially in opinion, that I am obliged to go into various details, both respecting the external appearance of the mineral itself, and of the opinions of mineralogists, in order to afford a correct view of the natural-historical species, to which these varieties belong, since this is the basis upon which every system, and, indeed, all accurate information in natural history, is founded, and the fixed point to which the one and the other must be referred.
page 128 note * Mohs' Grund-Riss der Mineralogie, Th. i. s. 408.
page 129 note * Voyages dans les Alpes, t. v. § 1313.
page 129 note † Traité, t. iii. p. 125.
page 129 note ‡ Hoffmann, “Handbuch der Mineralogie,” continued by Breithaupt, Th. ii. 2 s. 300.
page 130 note * Tabellen, 1800, p. 70.; 1808, p. 40.
page 130 note † Handbuch, Th. i. s. 326.
page 130 note ‡ Handbuch, Th. ii. p. 712.
page 131 note * Journal des Mines, XXXVIII. p. 161.
page 132 note * Mohs' Grund-Riss. Th. i. p. 264., &c.
page 133 note * Traité, 2de Ed. v. ii. p. 462.
page 139 note * Hoffmann's Handbuch, Th. ii. a. s. 339.
page 139 note † Traité, 2de Ed. T. iii. p. 95.
page 143 note * According to the descriptions given by Drs Hibbert and MacCulloch, the Diallage-rock from Shetland belongs likewise to this class. I cannot pass entirely unnoticed their labours in ascertaining the geological positions of these rocks; but not yet having had an opportunity of examining the rocks themselves, and having only recently become acquainted with the accounts published by Dr Hibbert in his Description of the Shetland Islands, p. 372., and by Dr MacCulloch, in the Quarterly Journal of Science, Literature and the Arts, vol, x. p. 103., I cannot at present dwell any longer upon this subject.
page 146 note * Gilbert, Annalen der Physik, &c. 1823.