Template:Benitoite

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Benitoite
Chemical composition BaTiSi3O9
Crystal system Trigonal
Habit Bipyramids
Cleavage None
Fracture Conchoidal
Hardness 6.5
Optic nature Uniaxial +
Refractive index 1.75-1.80
Birefringence 0.047
Dispersion High, 0.046
Specific gravity 3.65
Lustre Bright vitreous
Pleochroism Strong