Copper, Carbonate of

CuCO 3 . Syn. Diba′sic carbonate of copper , Dicarbonate of c. ; Cupri carbon as , L. Prep. Add carbonate of soda in exce to a solution of sulphate of copper, and warm the mixture till the pale-blue, flocculent precipitate becomes sandy and a umes a green tint. Used as a pigment. See Green Pigments and Verditer . Obs. As prepared above, the carbonate contains 2 equivalents of water. The beautiful green mineral, MAL′ACHITE , has a similar composition, but contains only 1 equiv. of water. Another carbonate ( TRIBASIC C. , BLUE C. ), occurs as a natural ore in large, transparent crystals, of the most intense blue; it has not yet been artificially imitated.