6 HORNBLENDE FAMILY. mities, the bevelling planes set on the obtuse lateral edges. 3. N° 2. in which the acute lateral edges are truncated. 4s. N° 3. in which the edges formed by the meeting of the acuminating and bevelling planes are again truncated. The crystals are small and very small, generally single, seldom resting on one another. The bevelling and truncating planes are dull. Principal fracture foliated, with a double oblique angular cleavage; the cross frac ture splintery or fibrous. The lustre of the principal fracture is splendent and metallic ; of the splintery, dull; of the fibrous, pearly and glimmering. It is opaque, but translucent in thin folia. It is soft. Affords a greenish- grey streak. It is slightly flexible. It feels greasy It occurs in primitive greenstone in the Hartz. Is nearly allied to Schillerstone.” Second Subspecies, Hornblende-Slate. Hornblende Schiefer, Werner. Corneus rigidus non nitens, apparenter lamellis parallelis; Cor nells fissilis, Wall.—Schistose Hornblende, Kiriv. vol. i. p. 222. —La Hornblende schisteuse, Brock, t i. p. 428.—Schiefrigcr Hornblende, lieuss, b. ii. s. 151.— Hornblendc-Schiefer, Lud. b. i. s. 120. Id. Suck, lr th. s. 238. Id. Bert. s. 187. Id. Hub s. 32. Id. Leonhard, label, s. 25.—Amphibole hornblende shisteux, Brong. t. i. p. 453.—Schiefrige Horn blende, Karst. Tabel. s. 38.—Hornblendc-Schiefer, Steffens, b. i. s. 310.—Schiefrige Hornblende, Lenz, b. i. s. 321 — Hornblendc-Schiefer, Oken, b. i s. 323. External Characters. Its colour is intermediate between greenish-black and blackish-green. It