ARSENIC. The fragments are indeterminate angular, and blunt- edged in the great, but slaty in the small. It usually occurs in large, coarse and small Iongish an- gulo granular distinct concretions ; also in concentric la mellar concretions. It is translucent; but in small leaves transparent. Its colour is not altered in the streak. It is soft. It is sectile. It is flexible ; but not elastic. It splits easily. Specific gravity, 3.313, Muschenbrock; 3.315, Per*- man ; 3.04S to 3.435, Kirwan. Constituent Parts. Turkey. Arsenic, . gg Sulphur, - gg 100 Klaproth, Beit. b. v. s. 238. Geognostic Situation. It occurs very rarely in primitive mountains, principal ly m flcetz rocks, where it is in veins along with copper- pyrites, iron-pyrites, quartz, and calcareous spar. . Geographic Situation. Europe.—It occurs, along with red silver-ore, in gra nite, at Wittichen in Swabia : in the Ilartz ; at Molda- wa and Saska in the Bannat; Nagyag, and Felsobanya in Transilvania ; Neusohl in Hungary ; Wallachia; and Servia. Asia-