Fluorite

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Fluorite
Chemical composition CaF2

Calcium fluoride

Crystal system Cubic
Habit Octahedral, cubes, interpenetrant twins
Cleavage Perfect, octahedral
Fracture Conchoidal
Hardness 4
Optic nature Isotropic
Refractive index 1.434
Birefringence Isotropic
Dispersion Very low, 0.007
Specific gravity 3.18
Lustre Poor vitreous
Fluorescence Bluish-white, purple (LW)
Fluorite