Template:Bixbite

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Bixbite
Chemical composition Be3Al2(SiO3)6 Beryllium aluminum silicate
Crystal system Hexagonal
Habit Prismatic
Cleavage Basal, poor
Fracture Conchoidal to uneven
Hardness 7.5 - 8
Optic nature Uniaxial -
Refractive index 1.561 - 1.577
Birefringence 0.004 - 0.009
Dispersion Low, 0.014
Specific gravity 2.63 - 2.72
Lustre Vitreous
Pleochroism Weak