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NATIVE TELLURIUM. 461 ORDER XIII—TELLURIUM. This Order contains four species, viz. Native Tellu rium, Graphic Tellurium, Yellow Tellurium-pre, and Hlack Tellurium-ore. 1. Native Tellurium. Gediegen Sylvan, Werner. Tellure natif aurifere et ferriferc, Ilawj, t. iv. p. 325.—Le Sil- vane natif, Brock, t. ii. p. 480.—Gediegen Tellur, Reuss, b. iv. s. G04. Id. Lud. b. i. s. 310. Id. Suck. 2 ter th. s. 492.— Gediegen Sylvan, Bert. s. 520. Id. Mohs, b. iii. s. 57.— Tellure natif, Lucas, p. 185.—Gediegen Tellur, Leonkard, Tabel. s v 80.—Telluie natif, Brong. t. ii. p. 125. Id. Brard, p. 3.Q1.—Gediegen Tellur, Karslen, Tabel. s. 70. Id. Ilaus. s - 70.—Tellurc natif uuro-ferriferc, Ilam/, Tabl. p. 119-— Gediegen Tellur, Ilaus. Ilandb. b. i. s. 129-—Native Tellu rium, Aikin, p. 70. External Characters. Its colour is intermediate between tin white and silver- w hite, and sometimes inclines to pale steel-grey. It occurs massive and disseminated; and, it is said, also cr ystallised in four sided prisms acutely acuminated with planes, which are set 011 the lateral planes, luternally it is shining, and the lustre is metallic. The fracture is foliated, or promiscuous radiated. It