malachite

[Gr. malache, moloche =mallow; suff. -ite ( Min.); Ger. malachit; Old Ger.moloch it.] Min.: A monoclinic mineral rarely found in crystals, but mostly as fibrous or compact stalag mitic ma es, with mammillary or botryoidal surfaces; or earthy. Crystals mostly twinned. Hardne , 3-5-4; specific gravity, 37-4:01. Luster of crystals adamantine, of fibrous kinds, silky to dull; color, bright green; streak, paler; translucent to opaque. Composition: Carbonic acid, 19-9; protoxide of copper, 71.9; water, 8.2; yielding the formula, CuOCO+CuOHO. Found with other copper ores extensively distributed, in great abundance in the Ural Mountains, Ru ia. The Ru ian mines, those of Nam aqua land, West Africa, and the Burra Burra mines, South Australia, yield a close variety which takes a high polish and is much used in inlay. ing work. malachite-green, s. Chem.: A green dye, consisting of the double zinc salt of a base, having the formula C23H24Ny. Mala. chite-green po e es many advantages over methyl. green, being cheaper, and le affected by soap, acids, or heat.