A glassy, usually yellowish gray variety of orthopyroxene having a magnesium silicate base, mainly MgSiO3 , usually found embedded in igneous rocks and meteorites.
A hard, brittle, orthorhombic pyroxene, MgSiO3, found in igneous rocks and in meteorites; magnesium silicate.
A glassy, usually yellowish gray orthorhombic variety of pyroxene. It is usually found in igneous rocks and meteorites. Chemical formula: Mg2Si2O6.