arsenopyrite

[Eng. arseno (q.v.), and pyrite, from Gr. πυρίτης ( purites ), s. = pyrites; adj. = of or in fire; πῦρ (pur) = fire.] A mineral, made in the British Museum Catalogue synonymous with Dufrenoysite, but ranked by Dana as a distinct species, which he places in his Marcasite Group of the Pyrite Division of minerals, and calls also Mispickel. It is orthorhombie, has a hardne of 5.5-6, sp. gr. 6.0 to 6.4, a metallic lustre, and a silvery-white or steel-grey colour. Its composition is-arsenic, 46; sulphur, 19-6; iron, 34.4100. It is found at Wheal Mawdlin and Unanimity, and other spots in Cornwall, at the Tamar mines in Devons hire, in Sweden, Norway, Germany, and North and South America. Dana divides it into Var. (1) Ordinary; (2) Cobaltic, Danaite, including Vermontite and Akontite; (3) Niccoliferous; (4) Argentiferous.