44 HORNBLENDE FAMILY. 9. Hyperstene. Hyperstene, Haiti/. Labrador Hornblende, liirw. vol. i. p. 221.—Diallagc metal-' loide, Hauy, t. iii. p. 127.—Labradorische Hornblende, Leon hard, Tabel. s. 25.—Hyperstene, Brong. t. i. p. 444. Id. Karst. Tabel. s. 40. Id. Haus. s. 98. Id. Hauy, Tabl. p. 44. Id. Steffens, b. i. s. 322. Id. Lenz, b. ii. s. 664. Id. Oken, b. i. s. 328. External Characters. Its colours are greyish-black, greenish-black, and brownish-black, which latter passes into chesnut-brown. Internally it reflects a colour intermediate between' copper red, pinchbeck-brown, and gold-yellow. It has hitherto been found only in rolled pieces. Internally its lustre is shining and semi-metallic. Its fracture is perfect foliated, with a twofold cleav age, in which the folia meet under angles of 80° and' 100°. The fragments are rather oblique rhomboid al. It occurs in large granular and lamellar concretions*. It is opaque. It becomes greenish-white in the streak. It is so hard as to scratch common hornblende. Specific gravity, 3.390, Klaproth. 3.376, Karslcn. Chemical Character. If is infusible before the blowpipe. Constituent