26.—Copper Pyrites.
Occurs in crystals and masses; color brass-yellow; tarnishes green; metallic lustre when freshly broken; can be cut with a knife; brittle; powder greenish black; on charcoal melts giving off sulphur fumes; dissolves in nitric acid, making a green liquid; gravity 4.2.
Value.—If of a fine yellow hue, it is a valuable copper ore (yielding from twelve to forty per cent.) and source of blue vitriol.
Localities.—Found in mountainous or granite regions with other ores. Lubec and Dexter, Me.; Franconia, Unity, Warren, Eaton, Lyme, Haverhill and Shelburne, N. H.; Corinth, Waterbury and Strafford, Vt.; Southampton, Turner’s Falls, Hatfield and Sterling, Mass.; Bristol and Middletown, Conn.; Ancram, Rossie, Wurtzboro’ and Ellenville, N. Y.; Phœnixville and Pottstown, Pa.; Bare Hills, Catoctin Mountains, near Newmarket and Finksbury, Md.; Phœnix and Walton Mines, Va.; Greensboro, Charlotte and Phœnix Mines, N. C.; Hiwassee Mines, Tenn; Cherokee, Rabun and Habersham Counties, Ga.; Presque Island, Lake Superior; Mineral Point, Wis.; Union, Keystone, Empire and other mines, Calaveras County, La Victoire and Haskell claims in Mariposa County, Amador and Plumas Counties, Cal.; near Virginia City, Mont.
