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Chemical composition CaMg(SiO3)2

Calcium magnesium sillcate

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