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  1. A monoclinic mineral, 8[FeAsS] ; pseudo-orthorhombic, prismatic, and metallic silver-white to steel gray; the most common arsenic mineral and principal ore of arsenic; occurs in many sulfide ore deposits, particularly those containing lead, silver, and gold. Syn: mispickel; arsenical pyrite; white pyrite; white mundic.
  2. The mineral group arsenopyrite, glaucodot, gudmundite, osarsite, and ruarsite.
    Source: Dictionary of Mining, Mineral, and Related Terms

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