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Chemical composition CaF2

Calcium Fluoride

Crystal system Cubic
Habit octahedral, cubes, interprenatrant twins
Cleavage perfect, octahedral
Fracture conchoidal
Hardness 4
Optic nature isotrope
Refractive index 1.434
Birefringence isotrope
Dispersion very low, 0.007
Specific gravity 3.18
Lustre poor vitreous
Fluorescence bluish-white, purple (LW)