leuco pyrite

[Gr. leukos =white, and Eng. pyrites; Ger. leukopyrit.] Min .: An orthorhombic mineral resembling Arsenopyrite (q. v.) in form. Cleavage, perfect in one direction; also ma ive. Hardne , 5-5.5; specific gravity, 62-743; luster, metallic; color, silver white or steel-gray; streak, grayish-black; fracture, uneven; brittle. Composition: Arsenic, 66'8; iron, 33.2, corresponding to the formula, Fe2Asg. Found in serpentine at Rei chen stein, Silesia, and in crystals at Geyer, Saxony. These, however, present a composition intermediate between this species and arsenopyrite (q. v.). leu-co-ro-sol-ic, a. [Gr. leukos =white, and Eng.rosolic.] (See the compound.)