Pyrite
Chemical Formula	(FeS2)
Species	Sulfides
Crystal System	Isometric
Mohs Scale	6
Specific Gravity	4.95-5.10
Color	Pale brass-yellow, tarnishes darker and iridescent
Streak	Greenish-black to brownish-black
Luster	Metallic
Refractive Index	不透明体
Diaphaneity	Opaque
Cleavage	Poor/IndistinctIndistinct on .
Fracture	Irregular/Uneven, Conchoidal
Crystal Habit：Cubic, faces may be striated, but also frequently octahedral and pyritohedron. Often inter-grown, massive, radiated, granular, globular and stalactitic.
Geological Setting：Common in many rock types, igneous, metamorphic and sedimentary.