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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 +
Refaction index 1.65-1.68
Birefringence 0.010
Dispersion low, 0.010
Specific gravity 3.3
Lustre vitreous
Pleochroism strong to moderate