Arsenopyrite
Chemical Formula	FeAsS
Species	Sulfides
Crystal System	Monoclinic
Mohs Scale	5-6
Specific Gravity	5.9-6.2
Color	Steel grey to silver white
Streak	Black
Luster	Metallic
Diaphaneity	Opaque
Cleavage	Distinct/GoodDistinct on ; in traces
Fracture	Irregular/Uneven
Crystal Habit：Acicular, off-square prismatic, stubby; striated; also compact, granular, columnar
Geological Setting：High temperature gold-quartz or tin hydrothermal veins, pegmatites, contact metamorphic rocks, gneisses, schists.