75.—Variegated Copper Ore.
Occurs in crystals and masses; metallic lustre; quickly tarnishes; color between copper-red and light-brown; powder pale grayish-black; dissolves in nitric acid; at a high heat melts to a copper globule; heated on charcoal gives off fumes of sulphur; gravity 5.
Value.—An important ore of copper yielding sixty per cent.
Localities.—Found in granite, freestone, etc., with other ores. Bristol and Cheshire, Conn.; Mahoopeny, Pa.; Copper Mines of N. J.