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•WHET-SLAtE. 439 4. Whet-Slate. Wetzschiefer, Werner. Schistus coticula, Wall. t. ii. p. 353.—Wetzschiefer, Wid. s. 402. Novaculite, Kirm. vol. i. p. 238.—Wetzschiefer, Estner, b. ii. s. 664. Id. Emm. b- i. s. 305.—Pietra cote, Nap. p. 270; Cos, Lam. t. ii. p. 10'$.—Le Schiste a aigiiiser, Brock, t. i. p. 393.—Argile schisteuse novaculaire, Hauy, t. iv. p. 448. Wetzschiefer, Ileuss, b. ii s. 149. id. Lud. b. i. s. 112. Id. Suck. l r th. s. 506. Id. Bert., s. 216. Id. Mohs, b. i. s. 460. Id. IIab. s. 42. Id. Leonhard, Tabl. s. 23.—Schiste coti- cule, Brong. t. i. p. 558.—Wetzschiefer, Ilaus. s. 87- Id- Karst. Tabcl. s. 38.—Novaculite, or Honcstone, Kid, vol. i. p. 216.—Wetzschiefer, Steffens, b. i. s. 211. Id. Lenz, b. ii. s. 576. Id. Oken, b. i. s. 359. External Characters. Its most common colour is greenish-grey; it is found also mountain, asparagus, olive, and oil green. It occurs massive. Internally it is feebly glimmering. The fracture in the large is straight slaty; in the Small, splintery. The'fragments are tabular. It is translucent on the edges. It is soft, inclining to semi-hard. It feels rather greasy. Specific gravity, 2.677, Karstcn, Geognostic Situation. It occurs in beds in primitive and transition clay-slate. Geographic F e 4
