42.—Limonite, or Brown Hematite.
Occurs in masses, with smooth rounded surfaces and fibrous structure; sometimes as hollow nodules, which are velvety-black inside; its powder when rubbed is yellowish-brown; when strongly heated turns black; scratches glass feebly; brittle; dissolves in hot aqua-regia; gravity 4.
Value.—A common ore of pig-iron, containing sixty per cent.; used also for polishing buttons, etc.
Localities.—Found in heavy beds with mica-slate, quartz, limestone, etc. Salisbury and Kent, Conn.; Amenia, Fishkill, Dover and Beekman, N. Y.; Richmond and Lenox, Mass.; Pittsfield, Putney, Bennington and Ripton, Vt.; Hamburgh, N. J.; Pikeland and White Marsh, Penn.; Marquette, Mich.; Makoquata River, Iowa; Iron Mountains, Stow and Green Counties, Mo.; Centerville, Ala.; near Raleigh and Smithfield, N. C.; on Coal Creek, Col.; and in coal areas generally.