Localities.—Found in copper and lead mines. Cheshire, Conn.; Brunswick and Schuyler’s Mines, N. J.; Morgantown, Cornwall, near Nicholson’s Gap, Perkiomen and Phœnixville Lead Mines, Pa.; Petapsco Mines, Md.; Davidson County N. C.; Polk County, Tenn.; Left Hand River and Mineral Point, Wis.; Falls of St. Croix, Minn.; Jefferson County and Mine la Motte, Mo.; Calaveras County, Cal.; Big Williams’ Fork, Ariz.; Wild Cat Cañon and near Virginia City, Mont.
46.—Manganese Spar.
Occurs in masses; glassy lustre; color flesh or rose-red; becomes black on exposure; tough; melted with borax gives a violet-blue color; gravity 3.5.
Value.—Used in glazing stone-ware.
Localities.—Found in granite regions, often with iron-ore. Blue Hill Bay, Me.; Cummington, Warwick and Plainfield, Mass.; Irasburg and Coventry, Vt.; Winchester, and Hinsdale, N. H.; Cumberland, R. I.; Franklin and Hamburg, N. J.
47.—Marble.
Occurs coarse and fine granular; frequently veined or mottled; brittle; can be cut with a knife; takes a polish; effervesces with acids; reduced to quicklime by heat; a gray variety contains stems and joints of worm-like fossils; gravity 2.5.
Localities.—Brandon, Rutland, Dorset, Shoreham, Pittsford, Middlebury, Fairhaven, Cavendish, Lowell, Troy and Sudbury, Vt.; West Stockbridge, Egremont, Great Barrington, Lanesboro, New Ashford, Sheffield, New Marlboro, Adams, Cheshire and Stoneham, Mass.; Clinton, Essex, Dutchess, Onondaga, Putnam, St. Lawrence, Warren and Westchester, Counties, N. Y.; Smithfield, R. I.; New Haven, Milford, Conn.; near Philadelphia, N. J.; Texas and Hagerstown, Md.; Lancaster County, Pa.; Jefferson and Genevieve Counties, Mo.; Knox and Sevier Counties, Tenn.; Joliet, Ill.; Cherokee and Macon Counties, N. C.; Marquette, Mich.; near Deep River and on the Michigamig and Menominee Rivers, Wis.
48.—Mica.
Occurs in masses, which can be split into very thin, elastic leaves; pearly lustre; at a high heat becomes opaque; gravity 3.