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C 3 21 ) FIFTEENTH SPECIES. Alum earth. Alaunsrde.—Werner. Ferra aluminaris, Wall. t. 2. p. 32 Alaunerde, Wid. 398.—Id. Ejlner, b. 2. f 647, I'd. Emm. b. f. 299— Aluminite bitumneux, Lam. t. 3. p. 116.—^La terre alumineufe, Broch. t. 1, p. 383. External CharaElers. Colour blackifh brown and brownifl) black. Maffive. Bull, fometimes glimmering, but this probably owing to an intermixture of mica. Frafture earthy, with a tendency to ftraight flaty. Breaks into tabular pieces. Streak Ihining. Feels a little meagre, and fomewhat greafy. Mild. intermediate between very fort and friable. Light, T t Chemical