426 ■ZINC. copper ; and the pure metal is also employed for a varie ty of other purposes. The use of calamine in the com position of brass was known at a very early period ; for it is mentioned by Aristotle, who also makes a distinc tion between the compound resulting from the mixture of copper and calamine, and that resulting from the mix ture of copper and tin *. 4. Blende. Blende, Werner. This species is divided into three subspecies, viz. Yel low Blende; Brown Blende ; and Black Blende. First Subspecies. Yellow Blende. Gelbe Blende, Werner. Id. Wem. Pabst. b. i. s. 188. Id. Wid. s. 898.—Yellow Blende, Kirrv. vol. ii. p. 238.—Gelb Blende, Emm. b. ii. s. 443.— La Blende jaune, Brock, t. ii. p. 350.—Gelbe Blende, Reuss, b - iv. s. 326. Id. Lud. b. i. s. 273. Id. Such 2t<* th. s. 367- Id. Bert. s . 464. Id. Mohs, b. iii. s. 557. Id. Leonhard, Tabel. S ’ ^ ^* ne sulphure jaune, Brong. t. ii. p. i4i.-i_Gelbe Blende, Karsten, Tabel. s. 70. Id. Haut. s. 77—Phospho rescent Blende, Aikin, p. 55. External Characters. Its colour is dark wax-yellow, and sulphur-yellow» which ? Aristot. ed. Paris, 1654, roL ii. p. 721.