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QJJAR.TZ FAMILY. Second, Subspecies. Lydian-Stone. Lidiseherstein, Werner. Lapis Lydius, Wall. t. 1. p. 353.—L. Stein, Wid. p. 360—Ba- sanite, Kirw. vol. i. p. 307.—Lidiseherstein, Estner, b. ii. s. 346. Id. Emm. b. i. s. 181.—Schisto silicea, Nap. p. 244. —Lydienne, Lam. t. ii. p. 384—La pierre de Lydie, Brock. t. i. p. 286.—Lydischerstein, Reuss, b. ii. s. 337. Id. Lwd. b. i. s. 85. Id. Mohs, b. i. s. 262. Id. Bert. s. 168. Id. Suck. 1. th. s. 363.—Jaspisartiger Kieselschiefer, Hab. s. 13. Jaspe schisteux, Brong. t. i. p. 328. Lydischerstein, Steffens, b. i. s. 176. Id. Hoff. b. ii. s. 79 —Lydit, Lens, b. i. s. 374. Id. 0ken. b. i. s. 297. External Characters. Its colour is greyish-black, which passes into velvet- black. It occurs massive, and also in trapezoidal-shaped rolled pieces, which have smooth and glistening surfaces. It is, like the preceding subspecies, traversed by quartz veins. Internally it is glimmering. The fracture is generally even, and approaches some times to flat conehoidal. The fragments are angular, more or less sharp-edged, and sometimes approach to the cubical shape. It is opaque It is hard, but not in so high a degree as flint. Rather difficultly frangible. Rather heavy. Specific gravity, 2.596, Kir wan. 2.629, Karslcin. 2.585, Hoff. Geognosttc