Forsterite
Chemical Formula	(Mg2SiO4)
Species	Silicates
Crystal System	Orthorhombic
Mohs Scale	7
Specific Gravity	3.21-3.33
Color	Colorless, green, yellow, yellow green, white
Streak	White
Luster	Vitreous
Refractive Index	n = 1.636 - 1.730 n = 1.650 - 1.739 n = 1.669 - 1.772
Diaphaneity	Transparent, Translucent
Cleavage	PerfectPerfect on imperfect on
Fracture	Conchoidal
Crystal Habit：Dipyramidal prisms often tabular, commonly granular or compact massive
Geological Setting：In mafic and ultramafic igneous rocks, metamorphosed impure dolomites