Occurs in crystals, usually in long, slender three-sided prisms which break easily, glassy lustre; brittle; becomes milk-white by heat; scratches rock-crystal and garnet; gravity 3.
Value.—Used for jewelry.
Localities.—Found in granite rocks. Paris, Albany and Hebron, Me.; Chesterfield and Goshen, Mass.; Newlin and Marple, Pa.
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.
76.—Wad.
Occurs in masses; earthy and loose; can be broken by the fingers, and soils; no lustre; melted with borax makes a violet glass; feels very light.