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MOLYBDENA. 491 ORDER XV.—MOLYBDENA. This Order contains but two species, viz. Moljbdena, »nd Molybdena-ochre. 1. Moljbdena, or Sulphurct of Molybdena.;.—? XV asserblei, Werner. r'errum Molybdaena ptira membrnnncea nitons, ("in part), Wall. t. ii. p. 249.—Wasserblci, Molybdscnu, Schede, i. d. Abliand. d. Scliwed. Acad. 1778, s. 238.—Wasserblci, Werner, f’abst. b. i. s. 221. Id. Wid. s. 9(>2.—Molybdena, Kiriv. vol. ii. p. 322.—Sulpliurc de Molybdene, Dc Bom, l. ii p 119-— V asscrblyy, Emm. b. ii. s. 541.—Molybdene sulphurd, Earn. t-i. p. 397. Id Ham/, t. iv. p. 289.—Le Molybdene sulphure, I^roch. t. ii. p. 432.—Wasserblci, Reims, b. iv. s. 4-78 Id. hud. b- i. s. 295.—Molybdankies, Suck. 2‘<f tb s. 437.—Wasserblei, Leri. s. 499. Id. Molts, b. iii. s. 588.—Molybdene sulphure, Lucas, p. 179 —Wasserblci, Leonhard, ’I abel. s. 80—Mc- lybdene sulphure, Rrong. t. ii. p. 92. Id. Brard, p. 381.— MolybdUn, Karslen, Tabel. s. 70.—Molybdankies, Ilaus.s. 76. -Molybdena, Kid, vol. ii. p. 216.—Molybdene sulphure, Hatty, Tabl. p. 114-—Molybdena, Aikin, p. fi2. External Characters. Its colour is fresh lead grey. It occurs usually massive, disseminated, in plates, and *° me times crystallised, in the following figures: 1. Regular