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( 79 ) XIX. BASALT FAMILY. This Family contains the following species: Basalt, Wacke, Clinkstone, and Iron-Clay. 1. Basalt. Basalt, Werner. Basaltes figura columnari, lateribus inordinatis, crystallisatus, Wall. gen. 22. spec. 150.—Basalt, Wid. s. 423.—Figurate Trap, Kirw. vol. i. p. 231.—Basalt, Eslner, b. ii. s. 726. Id. Emm. b. i. s. 339.—Basalto, Nap. p. 284.—Le Basalte, Broch. t. i. p. 4S0.—Lava lithoides basaltique, Hauy, t. iv. p. 474. —Basalt, Ileuss, b. ii. 2. s. 125. Id. Lad. b. i. s. 121. Id. Suck, lr th. s. 513. Id. Bert. s. 221. Id. Mohs, b. i. s. 502. Id. Ilab. s. 17. Id. Leonhard, Tabel. s. 23. Id. Brong. t. i. P- 455. Id. Karsten, Tabel. s. 36. Id. Kid, vol. ii. App. P* 6. Id. Steffens, b. i. s. 333. Id. Lenz, b. ii. s. 607. Id. Oken, b. i. s. 364. External Characters. Its most frequent colour is greyish-black, of different degrees of intensity; from this it passes into ash-grey, °r greenish-black. It occurs massive, in rolled pieces, and sometimes ve sicular. Internally it is dull, sometimes feebly glimmering. The fracture of the coarser varieties is large or small grained uneven; of the more crystalline varieties even in clining to large and flat conchoids!, and seldom to splin tery, The