Anatase

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Anatase
Chemical composition TiO2
Crystal system Tetragonal
Habit Dipyramidal
Cleavage Perfect
Fracture Sub-conchoidal
Hardness 5.5 - 6 (brittle)
Optic nature Uniaxial -
Refractive index 2.488 - 2.561
Birefringence 0.073
Specific gravity 3.89
Lustre Adamantine/metallic


Sources