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Chemical composition CaMg(SiO3)2

Calcium Magnesium Sillicate

Crystal system monoclinic
Habit prismatic, waterworn pebbles
Cleavage distinct
Fracture conchoidal
Hardness 5
Optic nature biaxial +
Refractive index 1.67-1.70
Birefringence 0.025
Dispersion low, 0.013
Specific gravity 3.3
Lustre vitreous
Pleochroism weak to moderate