From The Gemology Project
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Chemical composition Beryllium Aliminium silicate
Crystal system Hexagonal
Habit edit me
Cleavage edit me
Fracture edit me
Hardness 7.5
Optic nature edit me
Refraction index 1.57 - 1.58
Birefringence edit me
Dispersion edit me
Specific gravity 2.80
Lustre edit me
Pleochroism edit me