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434 CLAY-SLATE FAMILY. 2. Bituminous Shale. Brandschiefer, Werner. Shistus pinguis ? Wall. t. i. p. 3.-4.; Schistus carbonarius, Id. p. 358—Brandschiefer, Wid. s. 394—Bituminous Shale, Kirw. vol. i p. 183—Brandschiefer, Eslner, b. ii. s. 658. Id. Emm. b. i. s. 289—Schisto bituminoso, Nap p 263.— Argillite bitumineux, Lam. t. ii. p. 116—Variete de l’Argile schisteuse, Hauy.—Le Schiste bitumineux, Brock, t. i. p. 389. —Brandschiefer, Reuss, b. ii. s. 120. Id. Lud. b. i. s. 111. Id. Suck, lr th. s. 504. Id. Bert. s. 218. Id. Mohs, b. i. s. 456. Id. Leonhard, Tabel. ». 23. Id. Karsten, Tabel. s. 36—Bituminous Shale, Kid, vol. i. p. 189—Brandschier fer, Steffens, b. i. s. 204. Id. Lenz, b. i. s. 573. Id. Oken\ b. 1. s. 36l. , External Characters. Its colour is light brownish-black. It occurs only massive. Intel nally its lustre is glimmering. The fracture is rather thin and straight slaty. The fragments are tabular. It becomes resinous in the streak, but the colour is not changed. It is opake. It is very soft, approaching to soft. It is rather sectile, and easily frangible, jspecific gravity, 1.991, 2.049, Kirvcan. 2.060, Kar sten. Constituent