188 



COPPER ACETATE. 



c. Powdered. (Verdigris.) 



Note. Specimen 6 is a mixture of several basic acetates of copper, 

 prepared by subjecting copper plates to the action of acetic acid. 



211. ARSENATE. Cu 3 As0 4 . (Arseni ate of Copper.) 



a. Green powder. 



212. AESENITE. CnHAs0 3 . (Scheele's Green.) 



a. Light-green powder. 



213. CARBOXATE. Cu C 3 , Cu H 2 2 , H 2 0. 



a. Greenish powder. 



Note. This specimen was prepared from the sulphate by precipitation 

 with sodic carbonate. For native carbonate (malachite) , see the central 

 case, No. 9. 



6. Blue powder. (Verditer.) 



Note. This specimen was prepared from the nitrate by precipitation 

 with calcic carbonate. Formula 2 Cu C 3 , Cu H 2 2 . 



214. CHLORIDE. CuCl 2 . 



a. Green crystals. 



215. CHROMATE. CuCr0 4 ,5H 2 0. 



a. Brown powder. 



216. IODIDE. Cu I. 



a. Pale dirty-brown powder. 



217. LACTATE. Cu C 3 H 4 3 , H 3 0. 



a. Dark-green crystalline crusts. 



218. NITRATE. Cu (N 3 ) 3 , 3H 2 0. 



a. Blue crystals. 



6. Green powder. Cu 3 N0 3 H 2 0. (Basic Nitrate of 

 Copper.) 



219. OXIDE, CUPROUS. Cu 2 0. (Bed Oxide of Copper, Suboxide of 



Copper.) 



a. Reddish-yellow powder. 



Note. This specimen was prepared by the process given by Bottger, 

 Journ. Pharm. et Ghem., vol. xc., p. 163. 



220. OXIDE CUPRIC. CuO. (Black Oxide of Copper, Copper 



Monoxide.) 

 a. Black powder. 



221. SULPHATE. CuS0 4 . 



a. Crystals, prepared from copper pyrites. (Commercial 



Sulphate of Copper* Blue Stone.) 



b. Ditto, purified from iron, etc. 



c. A small column of very transparent crystals, presented 



by Mr. E. Richardson. 



