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346 AZURESTONE FAMf 4. Blue-Spar. Blauspath, Werner. ^ JVtd. Bergrfi. Joum. 1791) p. 345.—Felsite, Kirw. vol. i. p. 32(f. —Dichter Feldspath, Emm. b. i. s. 271 Le Feldspath com- pacte, Brock, t. i. p. 367.—Feld-spath bleu? Hauy, t. p. 605.—Dichter Feldspath, Reuss, b. ii. s. 46. Id. Lud. b. i. s. 100. Id. Suck. lr th. s. 420. Id. Bert. s. 238. Id. Mohs, b. i. s. 420. Id. Leonhard, Tabel. s. 19—Feldspath Bleu, Brong. t. i. p. 360—Splittriger Lazulit, Karsten, Tabel. s. 46. Blue Felspar, Kid, vol. i. p. 160.—Feldspath Bleu, Hauy, Tab!, p. 60.—Blauspath, Steffens, b. i. s, 420. Id. Hoff. b. ii' s. 287. Id. Lenz, b. i. s, 479. Id. Oken, b. i. s. S37. External Characters. Its colour is pale smalt-blue, which sometimes passes into sky-blue, and occasionally into milk-white. It occurs massive and disseminated. Internally it is glistening, which rarely approaches tb The fracture is imperfect foliated, inclining to splin tery. It is translucent in a low degree. It is hard, inclining to semi-hard ; scratches glass. It is rather difficultly frangible. Yields a greyish-white coloured streak. It is rather heavy, but in a low degree. Specific gravity, 3.046, Klaproth. 3.060, Karsten, Chemical Characters. Before the blowpipe it becomes white and opaque; and affords a black-coloured glass with borax. Constituent