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I ( 42 ) IV. ORDER.—SILVER. This Order contains eleven species, viz. Native Silver, Auriferous Silver, Antimonial Silver, Arsenical Silver, Bismuthic Silver, Corneous Silver-ore or Horn-ore, Sil- ver-glance or Sulphureted Silver, Brittle Silver-glance or Brittle Sulphureted Silver, Red Silver-ore, White Silver- ore, and Grey Silver-ore. 1. Native Silver. Gediegen Silber, Werner. Id. Wern. Pabst. b. i. s. 12. Id. Estner, b. iii. s. 319. Id. Emm. b. ii. s. 156.—L’Argent natif ordinaire, Brock, t. ii. p. 1 i 6.— Argent natif, Hatty, t. iii. p. 384.—Gediegen Silber, Ilcnss, b. iii. s. 310.—Geineiner gediegen Silber, Lud. b. i. s. 210. Id. Suck. 2ter th. s. 129- Id. Berl. s. 360. Id. Molts, b. iii. s. 102. Id. Hah. s. 102.—Argent natif, Lucas, p. 103 Geineiner gediegen Silber, Leonhard, Tabel. s. 53.—Argent natif, Brong. t. ii. p. 248. Id. Brard, p. 240.—Gediegen Silber, Karsten, Tabel. s. 60. Id. Hans. s. 69.—Native Sil ver, Kid, vol. ii. p. 83.—Argent natif, Ilany, Tabl. p. 73.— Native Silver, Aikin, p. 18. External Characters. Its colour is pure silver-white ; but the surface, by ex posure to the air, becomes yellowish-brown, or greyish- black. It occurs massive, disseminated, in blunt-cornered pieces, in plates, and in membranes: it is said also to occur in Spanish