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CHALK. 125 5. Chalk. Kreide, Werner. Crete alba, Wall. t. i. p. 27-— Kreide, Wid. s. 492.—Chalk, Kirm. vol. i. p. 77.—Kreide, Estner, b. ii. s. 917- Id. Emm. b. i. s. 433.—Creta commune, Nap. s. 331.—La Craie, Brock. t. i. p. 521.—Craie, Hauy, t. ii. p. 166.—Kreide, Rems, b. ii. 2. s. 259. Id. Lud. b. i. s. 145. Id. Suck, lr th. s. 583. Id. Bert. s. 87. Id. Mohs, b. ii. s, 9. Id. Hab. s. 70. Id. Leonhard, Tabel. s. 32.—Chaux carbonatee crayeuse, Brong. t. i. p. 208. Id. Brard, p. 29.—Kreide, Karslcn, Tabel. s. 50. Id. Ilaus. s. 126.—Chalk, Kid, vol. i. p. 18.—Kreide, Lenz, b. ii. s. 728. Id. Oken, b. i. s. 410. * External Characters. Its colour is yellowish-white, which sometimes passes to greyish-white, and snow-white. It is sometimes mark ed with yellowish-grey. It occurs massive, disseminated, in crusts, and in ex traneous external shapes. - It is dull. The fracture is coarse and fine earthy. The fragments are blunt-edged. It is opaque. It writes and soils. It is rather sectile. It is soft, and sometimes very soft. It is very easily frangible. It feels meagre and rough. It adheres slightly to the tongue. It is light. Specific gravity, 2.252, Mushenbroeck. 2.315, Kirwan. 2.400, 2.675, Gerhard. 2.657, Watson. Chemical