Brochan tite

is a sub sulphate of copper observed in small crystals at Ekaterinenbourg in Siberia. 13. Sulphuret of Copper ; Kupferglanz. Of a steel gray metallic aspect; crystallizes in rhomboids; specific gravity 5·69; somewhat sectile, yet brittle; fusible with intumescence at the blowpipe, and yields a copper bead with soda; soluble in nitric acid; becomes blue with ammonia, but lets fall scarcely any oxide of iron. Its constituents are, sulphur 19; copper 79·5; iron 0·75; silica 1·00. It occurs in small quantities in Cornwall, . The chemical preparations of copper which constitute distinct manufactures are, Blue or Roman vitriol; for which see Sulphate of Copper ; Scheele’s green and Schweinurth green , Verditer , and Verdigris . See these articles in their alphabetical places.