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yellow lead-ore. 407 12. Yellow Lead-Ore, or Molybdate of Lead. Gelbes Bleierz, Werner. Id. Werner, Pabst. b. i. s. 127- Id. Wid. s. 864..—Oxide de Plomb spathique jaune, De Born, t. ii. p. 379. Yellow Lead-spar, Kim,, vol. ii. p. 212.—Gelbes Bleyerz, Emm. b. ii. s. 403.—Plomb molybdate, llauxj, t. iii. p. 498.—La Mine de Plomb jaune, ou le Plomb jaune, Brock. t. ii. p. 322. —Gelb Bleierz, lieuss, b. iv. s. 236. Id. Lad. b. i. s. 264. Id. Suck. 2t=r th. s. 340. Id. Mohs, b. iii. s. 535.—Plomb molybdat6, Lucas, p. 120.—Gelb Bleierz, Leonhard, Tabel. s. 72.—Plomb molybdate, Brong. t. ii. p. 205. Id. Brard, p. 074. Gelbleierz, Karsten, Tabcl. s. 68.—Bleigelb, Haas. s. 140.—Plomb molybdate, llamj, Tabl. p. 83—Molybdate of Lead, Kid, vol. ii. p. 139- Id. Atkin, p. 50. External Characters. Its most frequent colour is wax-yellow ; from which it passes, on the one side, into lemon-yellow and orange- yellow ; on the other side, into yellowish-brown and yel lowish-grey : sometimes of a colour which is intermediate between yellowish-white and greyish-white. It occurs massive, in crusts, cellular ; and crystallised in the following figures: 1. Octahedron, with equilateral triangular planes *, fig. 242. 2. Octahedron truncated on the angles +, fig. 243. Get 3. The * Plomb molybdate priinitif, Hauy. t Plomb molybdate epointe, llauy.