(Mg,Fe)2SiO4Orthorhombic
Olivine
(Mg,Fe)2SiO4
SilicatesChemical Formula(Mg,Fe)2SiO4
Crystal SystemOrthorhombic
Mohs Hardness6.5
Specific Gravity3.32
ColorOlive green to yellowish green
LusterVitreous
StreakWhite to colorless
CleavageIndistinct
FractureConchoidal
Occurrence
Major component of Earth upper mantle. Found in basalt and peridotite. Gem variety is peridot.