Hedenbergite
Chemical Formula	CaFeSi2O6
Species	Silicates
Crystal System	Monoclinic
Mohs Scale	5-6
Specific Gravity	3.65
Color	brownish green, black
Streak	white, grey
Luster	Vitreous, Dull
Refractive Index	n = 1.699 - 1.739 n = 1.705 - 1.745 n = 1.728 - 1.757
Diaphaneity	Transparent, Opaque
Cleavage	Distinct/GoodGood on
Fracture	Irregular/Uneven, Conchoidal
Crystal Habit：Short prismatic crystals, columnar or acicular aggregates, granular, lamellar, massive.
Geological Setting：Metamorphosed iron formations, Fe-Mn skarns, alkalic granites, xenoliths in kimberlite.