with the same hemihedral symmetry as pyrites; crystals have usually the form of cubes or cubo-octahedra, but are imperfectly developed and of some-what rare occurrence. More often the
and nickel, and as the latter increases in amount there is a passage to the isomorphous species chloanthite (NiAs2). It occurs in veins with ores of cobalt, nickel, copper and silver: the best known locality is Schneeberg in
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