Green Beryl

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From The Gemology Project
Green Beryl
Chemical composition Be3Al2(SiO3)6 Beryllium aluminium silicate
Crystal system Hexagonal
Habit Prismatic
Cleavage Imperfect, basal
Hardness 7.5
Optic nature Uniaxial -
Refractive index 1.564 - 1.593
Birefringence 0.005-0.006
Dispersion Low, 0.014
Specific gravity 2.68-2.72
Lustre Vitreous
Pleochroism Weak to distinct
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