Enstatite

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Enstatite
Chemical composition (Mg,Fe)SiO3

Magnesium silicate

Crystal system Orthorhombic
Habit Crystals and waterworn pebbles
Cleavage Distinct
Fracture Sub-conchoidal
Hardness 5.5
Optic nature Biaxial +
Refractive index 1.65-1.68
Birefringence 0.010
Dispersion Low, 0.010
Specific gravity 3.3
Lustre Vitreous
Pleochroism Strong to moderate