LOCALITIES.--Found in granite, slate and limestone rocks. Warren, Essex, Clinton, Saratoga, Herkimer, Orange and Putnam Counties, N. Y.; Raymond and Marshall’s Island, Me.; Franconia, Jackson, Winchester, Lisbon, Swanzey and Unity, N. H.; Bridgewater, Chittenden, Marlboro, Rochester, Troy and Bethel, Vt.; Cambealon, R. I; Hawley and Bernardston, Mass.; Haddam, Conn.; Goshen, Webb’s Mine, Cornwall and White Marsh, Penn.; Hamburg, N. J.; Scott’s Mills and Deer Creek, Md.; Mitchell and Madison Counties, N. C.; Spartanburg, S. C.; Laclede and Crawford Counties, Mo.; Sierra County, (Gold Valley,) Plumas, Tulare, Mariposa, Placer and El Dorado Counties, Cal. 44.--MAGNETIC PYRITES. Occurs massive; brittle; deep orange-yellow; powder grayish-black; metallic lustre; tarnishes easily; slightly attracts the compass-needle; melts at a high heat, giving off sulphur-fumes; gravity 4.5. VALUE.--Affords sulphur, copperas and nickel. LOCALITIES.--Found in granite regions, often with copper and iron ores. Stafford, Corinth and Shrewsbury, Vt.; Trumbull and Monroe, Conn.; Port Henry, Diana and Orange County, N. Y.; Hurdstown, N. J.; Gap Mine, Lancaster County, Pa.; Ducktown Mines, Tenn. 45.--MALACHITE. Occurs in incrustations with smooth surface and fibrous; powder paler green than the mineral; brittle; by heat crackles and turns black; effervesces in acids; takes a fine polish, showing bands or rings; gravity 4. VALUE.--Used for jewelry and inlaid work. 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.