69.—Steatite.
Occurs in masses, consisting of minute pearly scales or grains; can be marked by the nail; hardens by heat; soapy feel; gravity 2.5.
Value.—Used for fire-stones, tubes, in manufacture of porcelain, etc.
Localities.—Found in beds with limestone, serpentine and slate. Orr’s Island, Me.; Francestown, Keene, Orford and Pelham, N. H.; Athens, Cavendish, Marlboro, Moreton, New Fane, Bradboro, Troy, Waterville, Westfield, Weathersfield and Windham, Vt.; Middlefield, Lenox and Westfield, Mass.; Manayunk and Chestnut Hill, Pa.; Albemarle and Loudon Counties, Va.; Staten Island and St. Lawrence County, N. Y.; Bare Hills, Md.
70.—Strontianite.
Occurs in crystals and in fibrous or granular masses; glassy lustre; brittle; thin pieces melt before a blow-pipe tinging the flame red; effervesces with acids; gravity 3.6.
Value.—A source of nitrate of strontia used in fire-works.
Localities.—Found in limestone. Schoharie, Muscalonge Lake, Chaumont Bay and Theresa, N. Y.
71.—Sulphur.
Occurs in crystals, masses and crusts; brittle; can be easily cut; burns with a blue flame and sulphur odor; gravity 2.