Underground Treasures: How and Where to Find Them / A Key for the Ready Determination of All the Useful Minerals Within the United States

by James Orton

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.