A System of Mineralogy (Volume 2) (Paperback)

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: 4. Kyanite, or Cyanitd. Kyauit, Werner. Sappare, Sauttvre, Voyages, 1900. and Jour.de Phys. 1789, p. 213.?-Cyanite, Wid. s. 475. Id. Kirnan, vol. i. p. 209. Id. Etltter, b. ii. s. 690. Id. Emm. b. i. a. 412. Id. Nap. p. 328. Id. Lam. t. ii. p. 256.?Disthene, Hauy, t. iii. p. 220. ?La Cyanite, Broch. t. i p. 501.?Cyanit, Reuss, b. ii. 2. s. 61. Id. Lud. b. i. s. 139. Id. Suck. lr th. s. 463. Id. Bert. s. 285. Id. Mohs, b. i. s. 575. Id. Hab. s. 34?Disthene, Lucas, p. 76.?Cyanit, Leonkard, Tabel. s. 30?Dis- tbene, Brong. t. i. p. 423. Id. Brard, p. 186.?Cyanit, Kartlen, Tabel. s. 48.?Kyanit, Haus. s. 102.?Cyanite, Kid, Tol. i. p. 182.?Disthene, Hauy, Tabl. p. 54?Kyanit, Stef feat, b. i. s. 299.?Cyanit, Lenz, b. ii. s. 696.?Talkschorl, Oken, b. i. s. 30S. External Character. Its colotfts are milk-white, passing into bluish-grey, Berlin-blue, and sky-blue, which latter borders on celandine-green. The white varieties are often marked with blue-coloured flame delineations. It occurs massive, disseminated; and crystallised in the following figures: 1. Oblique four-sided prism, with two opposite broad and two opposite narrow planes . 2. Oblique four-sided prism, truncated on the two op posite acute lateral edges f, fig. 111. S. Preceding3. Preceding figure, In which all the lateral edges are Forme primitive, Hauy. Distbcne pcribezaedre, Hnuy. truncated. 4. Twin-crystal: it may be considered as two flat four-sided prisms joined together by their broader lateral planes . The narrow lateral planes are longitudinally streaked, find glistening: the broad are smooth and splendent. The crystals are middle-sized, small, and very small; are singly imbedded, or intersect one another. The lustre is splendent and peafly. The fracture is broa...