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Arsenopyrite (FeAsS) J00690      Crystal system monoclinic. Habit elongated, striated prismatic crystals; granular masses are common; twinning is common. Cleavage distinct or in traces depending on orientation. Fracture uneven. Hardness 5.5-6 Specific Gravity 6.2 Color silver white to steel gray with pink tints. Luster opaque with a metallic luster. Streak black. Distinguishing features produces sparks when struck with a hammer and gives off a strong odor of garlic. Uses this is the main ore of arsenic and found typically with tin, gold, silver and cobalt.

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