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( 46 )' XVIII. CHRYSOLITE FAMILY. This Family contains the following species: Sahlite, Augite, Diopside, Chrysolite, Olivine, and Lievrite. J 1. Sahlite. Sahlit, Werner. .Sahlit, D’Andrada, Scherer’s Journal, b. iv. 19. s. 81. Id. Schumacher, Verzeichniss, s. 32. Id. Hauy, t. iv. p. 379. Id. Broch. t. ii. p. 518. Id. Reuss, b. ii. 1. s. 474. Id. Lud. b. ii. s. 158.—Malacolith, Suck. l r th. s. 186. Id. Bert. s. 162. Id. Mohs, b. i. s. 488.—Malacolithe, Lucas, p. 201 Sahlit, Leonhard, Tabel. s. 31.—Malacolithe, Brong. t. i. p. 445. Id. Brard, p. 414.—Sahlit, Karsten, Tabel. s. 44.—Salait, Haus. s. 98.—Pyroxene laminaire gris-verdatrc, Hauy, Tabl. p. 42. —Malacolith, Steffens, b. i. s. 354.—Sahlit, Lenz, b. ii. s. 700. —Schaligcr Pyroxene, O/cen, b. i. s. 333. External Characters. Its colour is greenish-grey, passing into a variety in termediate between mountain-green and asparagus-green. It occurs massive, and crystallised in rectangular four sided prisms, in which the terminal planes are set ob liquely on the lateral planes *. A great many varieties of * According to Bournon, the primitive form of Sahlite is a rectangular four-aided prism, having rectangular bases, which are inclined or. the two opposite sides of the prism, so as to form angles of 10G° 15’, and 73° 45'. This measurement, which was made with the greatest care, differs from that of Hauy, who affirms that the primitive form is the same as that of augite.