.FLINT GENUS. FOURTH SPECIES. Augite. Augit. —Wirner. Pyroxene, Daub. p. Ir.—Augit, FJlner, b. 2. f. no. IJ. Emm. b. 3. f. 24:—Volcanite, Lam. t. 2. p. 327 L’Augite, Broch. 1.1. p. 179.—Pyroxene, Iiauy. t. 3. p. 80. J 9 External Characters. Its chief colour is blackifh green, which fometimes pailes into greenith black; it feldom pafles to leek green and ftill feldomer into a kind of liver brown. It occurs moftly in indeterminately angular pieces and roundilh grains, and fometimes cryftallized. Its eryltallization is as follows: Broad rectangular fix-fided prifm, with two broad- er and four fmalier lateral planes, bevilled on both extremities, and the bevilling planes fet obliquely but parallely on thofe lateral edges, which are formed by the fmalier lateral planes. When thefe edges are truncated it forms an cight.fided prifm, where the be villing