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.