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16.4.6: Green Beryl

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    4035
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    Green Beryl
    Chemical composition Be3Al2(SiO3)6Beryllium 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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