Template:Ruby

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Ruby
Chemical composition Al2O3
Crystal system Trigonal
Habit Prismatic, tabular
Cleavage Poor
Fracture Conchoidal
Hardness 9
Optic nature Uniaxial -
Refractive index 1.76-1.78
Birefringence 0.008-0.009
Dispersion Low, 0.018
Specific gravity 4
Lustre Bright vitreous
Pleochroism Weak to moderate