52.—Platinum.
Occurs in grains or lumps; metallic, silvery lustre; can be hammered out; heavier and harder than silver; not dissolved in nitric acid; gravity 17.
Value.—Nearly equal to Gold. Used for making chemical and philosophical apparatus, for coating copper, brass, etc.
Localities.—Found in river-gravel with Gold. Rutherford County, N. C.; Klamath region, Cape Blanco, on Salmon River, South Fork of Trinity, Butte, Honcut, Cañon and Wood’s Creeks, and on Middle Fork of American River, Cal.; at Gold Flat, Nev.