Template:Chrysoberyl

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Chrysoberyl
Chemical composition BeAl2O4
Crystal system orthorombic
Habit pseudo-hexagonal twins
Cleavage weak to moderate
Fracture conchoidal to uneven
Hardness 8.5
Optic nature biaxial +
Refractive index 1.74-1.75
Birefringence 0.009
Dispersion low, 0.014
Specific gravity 3.72
Lustre bright vitreous
Pleochroism moderate to strong