VALUE.--Nearly equal to _Gold_. Used for making chemical and philosophical apparatus, for coating copper, brass, etc. LOCALITIES.--Found in river-gravel with _Gold_. Rutherford County, N. C.; Klamath region, Cape Blanco, on Salmon River, South Fork of Trinity, Butte, Honcut, Cañon and Wood’s Creeks, and on Middle Fork of American River, Cal.; at Gold Flat, Nev. 53.--RED COPPER ORE. Occurs in crystals and masses; cochineal-red; powder brownish-red; nearly opaque; brittle; dissolves in nitric acid; heated on charcoal yields a globule of copper; gravity 6. VALUE.--Affords copper, (sixty per cent.,) and blue vitriol. LOCALITIES.--Found in trap regions with other copper ores. Schuyler’s, Somerville, New Brunswick and Flemington Mines, N. J.; Cornwall, Pa.; Ladenton, N. Y.; Lake Superior Region. Not abundant. 54--RED HEMATITE. Occurs in compact masses, with rounded surfaces or kidney-shaped; fibrous structure; color brownish-red to iron-black; but powder invariably red; when black, the lustre is somewhat metallic, otherwise dull; brittle; scratches glass with difficulty; dissolves slowly in strong muriatic acid; gravity 4.5 to 5. VALUE.--An ore of iron, yielding from thirty-six to fifty per cent. In powder, used as pigment and for polishing metals. LOCALITIES.--Found usually in beds with granite or limestone. Aroostook County and Hodgdon, Me.; Antwerp, Ticonderoga, Crown Point and Gouverneur, N. Y.; Vernon, N. J.; West Whiteland, Pa.; Chatham and Orange Counties, N. C.; Marquette, Mich; Shasta County, Cal. This mineral graduates into a soft, earthy variety, called _red ochre_, and into a compact, slaty variety, called _red chalk_, which has a clayey odor when breathed on. 55.--RED SILVER ORE. Occurs in crystals and masses; metallic lustre; brittle; powder cochineal-red; easily cut; at a high heat yields a silver globule; the powder heated with potash turns black; gravity 6. VALUE.--An ore of silver yielding sixty per cent. LOCALITIES.--Found at gold and silver mines. Washoe and Austin, Nev.; Poorman Lode, Idaho. 56.--RENSSELAERITE. Occurs in masses; wax-like; a trifle harder than marble; when fresh can be scratched by the nail; soapy feel; takes a polish; cleavable; gravity 2.8. VALUE.--Used as a marble and worked into inkstands, etc. LOCALITIES.--Found with _steatite_, _serpentine_, limestone, etc. Antwerp, Canton, Fowler, De Kalb, Edwards, Russell and Gouverneur, N. Y. 57.--ROCK CRYSTAL. Occurs in crystals and masses; transparent; glassy lustre; colorless; tough; brittle; not acted upon by acids or heat; electric by friction; gravity 2.5. VALUE.--Cut for ornaments, lenses, etc. LOCALITIES.--Common in sandstone, limestone and iron ore. Paris, Me.; Benton and Bartlett, N. H.; Sharon and Woodstock, Vt.; Pelham and Chesterfield, Mass.; Ellenville, Little Falls, Watervliet, Fairfield, Middleville, Fowler, Antwerp, Rossie, Lake George and Palatine, N. Y.; Minnesota Mine, Lake Superior; Ouachita Spring, Ark. 58.--ROCK SALT.