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114 COPPER. gradually produced in consequence, as often as a fresh surface is exposed to the action of the air *. 4. It was formerly confounded with Copper-glance, Copper-pyrites, and lied Copper-ore ; but Werner as certained it to be a distinct species, and gave it its pre sent name from its tarnish, which is one of the most striking features in its external aspect. 4. Copper-Pyrites or Yellow Copper-Ore. Kupferkies, Werner. Minera Cupri flava, Wall. t. ii. p. 282—Mine de Cuivrc jaune, Rome de Lisle, t. iii. p. 80f).—Kupferkies, Werner, Pabst. b. i. s. 75. Id. Wid. s. 746.—Copper-Py rites or Yellow Copper- Ore, Kirtv. vol. ii. p. 140.—Mine de Cuivre jaune, De Born, t. ii. p. 313.—Kupferkies, Estncr, b. iii. s. 494. Id. Emm. b. ii. s. 232.—Cuivre pyriteux, Lam. t. i. p. 197. La Pyrite cuivreux, Brock, t. ii. p. 169—Kupferkies, Iieuss, b. iii. s. 415. Id. Lud. b. i. s. 223. Id. Suck. 2 { er th. s. 181. Id. Bert. s. 386. Id. Mohs, b. iii. s. 239. Id. Ilab. s. 107—Cuivre pyriteux, Lucas, p. 125.—Kupferkies, Leonhard, Tabel. s. 57* —Cuivre pyriteux, Brong. t. ii. p. 213. Id. Brard, p. 283— Kupferkies, Karsten, Tabel. s. 62. Id. Ilaus. s. 71—Yellow Sulphuret of Copper, Kid, vol. ii. p. 109.—Cuivre pyriteux,. Tlauy, labl. p. 85.—Yellow Copper, Aikin, p. 28. External Characters. On the fresh fi’acture, its colour is brass-yellow, of dif ferent shades : that which contains the greatest quantity of * Kid’s Min. vol. ii. p. 108, 109.