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Tashmarine Diopside
Chemical composition CaMg(SiO3)2

Calcium magnesium silicate

Crystal system Monoclinic
Habit Prismatic, waterworn pebbles
Cleavage Distinct
Fracture Conchoidal
Hardness 5
Optic nature Biaxial +
Refractive index 1.667-1.693
Birefringence 0.025
Dispersion Low, 0.013
Specific gravity 3.29
Lustre Vitreous
Pleochroism Weak to none

Tashmarine™ is a trade name for yellowish green diopside found in, amongst other places, Tashkent, Uzbekistan.