A System of Mineralogy (Volume 1)
by Robert Jameson
ISBN 0217435882 (0-217-43588-2)
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Softcover, General Books LLC, 2012
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Book summary: This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1816. Excerpt: ... IV. SCHORL. FAMILY. This family contains the following species: Topaz, Schorlite, Pyrophysalite; Euclase, Emerald; Iolite ; Schorl, Epidote, Zoisite; and Axinite. 1. Topaz f. Topaz, Werner. Topazius octaedricus prismaticus, Wall. t. I. p. 251.--Topaze du Brezil, R. d. L. t, 2. p. 230.--Topaze de Saxe, Id. p. 260.--Topaz, Wern. Cronst. p. 97.--Id. Wid. p. 267.--Occidental Topaz, Kirtv. vol. i. p. 254.--Topaz, Estner. b. 2. f. 98Id. Emm. b. 1. f. 374.--Topazio, Nap. p. 136.--Topaze du Brezil, de Saxe et de Siberie, Lam. t. 2. p. 254.--Id. Broch. t. i. p. 212.--Id. Hauy, t. ii. p. 504.--Topaz, Roiss, b. ii. th. ii. s. 40.--Id. Lud. b. i. s. 68.--Id. Suck. 1. th. s. 455.--Id. Bert. s. 294.--Id. Mohs, b. i. s. 27.--Id. Hab. s. 54.--Id. Lucas, s. 43.--Id. Brotig. t. i. p. 419.--Id. Brard, p. 116.--Id. Kid, vol. i. p 145.--//. Hauy, Tabl. p. 17.--Id. Steffens, b. i. s. 33. External Characters. Its principal colour is wine-yellow, which occurs of all degrees of intensity. The pale wine-yellow passes into yellowish-white, greyish-white, greenish-white, mountain-green, and celandine-green. The lolite has sometimes been arranged under the Ruby Family, but its true place is in the Schorl Family. f The name Topaz is derived from Topazos, a small island in the Red Sea, where, it is said, the Romans used to collect their topaz, which is the Chrysolite of the moderns. The dark wine-yellow passes from orange-yellow through cherry-red into violet-blue . It occurs seldom massive; disseminated, and in rolled pieces; most frequently crystallised., Its crystallizations are as follow: 1. Oblique four-sided prism, rather acutely acuminated by four planes, which are set on the lateral planes f. t. N 1. in which the acuter lateral edges are bevelled; or it may be viewed as an eig...
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