Template:Andalusite

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Andalusite
Chemical composition Al2SiO5
Crystal system orthorhombic
Hardness 7.5
Optic nature biaxial -
Refaction index 1.63-1.64
Birefringence 0.010
Dispersion low, 0.016
Specific gravity 3.18
Lustre vitreous
Pleochroism very strong