Template:Aquamarine

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Aquamarine
Chemical composition Be3Al2(SiO3)6 Beryllium aluminum silicate
Crystal system Hexagonal
Habit Prismatic
Cleavage Imperfect, basal, almost never seen
Hardness 7.5 to 8
Optic nature Uniaxial -
Refractive index 1.577-1.583
(+0.017, - 0.017)
Birefringence 0.005-0.009
Dispersion Low, 0.014
Specific gravity 2.72
(+0.18,-0.5)
Lustre Vitreous
Pleochroism Weak to moderate