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Maxixe beryl
Chemical composition Be3Al2(SiO3)6 Beryllium aluminum silicate
Crystal system Hexagonal
Habit Prismatic
Cleavage Poor, basal
Fracture Conchoidal to uneven
Hardness 7.5
Optic nature Uniaxial -
Refractive index 1.579 - 1.592
Birefringence 0.007
Dispersion Low, 0.0014
Specific gravity 2.69 - 2.8
Lustre Vitreous
Pleochroism Distinct