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YELLOW ORPIMENT. 537 Second Subspecies. Yellow Orpiment. Gelbes Rauscbgelb, Werner. A^'sof Theophrastus; by the later Greeks written —Arsenicum, Plin. Hist. Nat. xxxiv. 18. s. 56. (cd. Bib. v. 269.) Arsenicum auripigmentum, Wall., t. ii. p. 163.—Or piment, Orpin, Koine de L. t. iii. p. 39—Gelbes Rauscbgelb, Hern. Pabst. b. i. s. 210. Id. Wid. s.972—Orpiment, Kirn. .vol. ii. p. 260—Oxide d’Arsenic sulphure jaune, De Born, t. ii. p. 202—Gelbes Rauschgelb, Emm. b. ii. s. 559—Ar senic sulphure jaune, Ham/, t. iv. p. 234—Le Realgar jaune, Broch. t. ii. p. 444— Gelbes Rauscbgelb, Keuss, b. iv. s. 512. Id. Lud. b. i. s. 300—Gclbor Schwefelarsenic, Suck. 2“* til. s. 450.—Gelb-rauschgelb, Bert. s. 504. Id. Mohs, b. ii. s. 283v —Arsenic sulphure jaune, Lucas, p. l6’4.—Gelbes Rausch gelb, Leonhard, Tabel. s. 78—Arsenic sulphure, Orpiment, Bivng. t. ii. p. 89.—Arsenic sulphure jaune, Brard, p. 363. —Bliittrigcs Rauscbgelb, Karstcn, Tabel. s. 74.—Arsenic sul phure jaune, Ham/, Tabl. p. 109—Native Oipiment, Kid, vol. ii. p. 206.—Orpiment, Aikin, p. 64. ^ External Characters. Its colour is perfect lemon yellow, which sometime* tuns into red, green, and brown colours. It occurs massive, disseminated, stalactilic, reniforni, ^“tryoidal, in crusts, and minute crystals. On the fresh fracture it is splendent, and the lustre is intermediate between adamantine and semimetallic. The fracture is curved foliated, with a single cleavage. The