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. VALUE.--Used for doors of stoves, etc. LOCALITIES.--Found in granite regions. Buckfield, Freeport and Oxford, Me.; Acworth, Grafton and Alstead, N. H.; Chesterfield, Barre, Mendon, South Royalston, Brimfield, Goshen and Russell, Mass.; Monroe, Haddam and Middletown, Conn.; Warwick, Edenville, Edwards, Monroe and Greenfield, N. Y.; Pennsbury, Thornbury, Unionville, Middletown and Chestnut Hill, Pa.; Jones’ Falls, Md. 49.--MICACEOUS IRON ORE. Resembles _Specular Iron Ore_, but consists of thin shining scales or leaves; powder dark red; a thin flake is translucent, showing red light; feels somewhat slippery. VALUE.--Used as an ore of iron and for polishing. LOCALITIES.--Hawley, Mass.; Piermont, N. H.; Ticonderoga, N. Y.; Warwick, Penn.; Loudon County, Va. 50.--NITRE. Occurs in thin crusts, delicate needles, or disseminated through the loose earth in caves; glossy lustre; brittle; cool, saline taste; crackles and burns brightly on live coals; a little harder than _Gypsum_. VALUE.--Used in the manufacture of gunpowder, fulminating powders, nitric acid, etc. LOCALITIES.--Marion County, Ky.; White County, Tenn.; near Rosiclare, Ill.; Silver Peak, Nev. 51.--OXYD OF MANGANESE. Occurs in masses and little columns, often with small rounded surfaces; one ore is soft enough to be impressed by the nail, and soils; the other will scratch glass faintly; heated with borax, makes a violet glass; dissolves in hot muriatic acid, giving forth a yellowish-green gas; gravity 4 to 5. VALUE.--Used for bleaching and for obtaining oxygen. LOCALITIES.--Found in granite regions, often with iron-ore. Brandon, Bennington, Monkton, Irasburg and Chittenden, Vt.; Hillsdale, Westmoreland and Westchester, N. H.; Plainfield, West Stockbridge and Conway, Mass.; Salisbury and Kent, Conn.; Montgomery County, Md.; Lake Superior Mining Region; Dubuque, Iowa; Deep Diggings, Mo.; Red Island, Cal.; Martinsburg, N. Y. 52.--PLATINUM. Occurs in grains or lumps; metallic, silvery lustre; can be hammered out; heavier and harder than silver; not dissolved in nitric acid; gravity 17.