Skutterudite
Chemical Formula	(Co,Ni,Fe)As3
Species	Arsenic
Crystal System	Isometric
Mohs Scale	5-6
Specific Gravity	6.5
Color	Tin-white to silver-gray, tarnishes gray or iridescent; in polished section, gray, creamy or golden white
Streak	Black
Luster	Metallic
Diaphaneity	Opaque
Cleavage	Distinct/GoodDistinct on in traces on
Fracture	Irregular/Uneven, Conchoidal
Crystal Habit：Crystals are cubes, octahedra, dodecahedra, rarely prismatic; in skeletal growth forms, distorted aggregates; also massive, granular
Geological Setting：Moderate to high temperature hydrothermal veins