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Chemical composition C
Crystal system Cubic
Habit Octahedral, cubic
Cleavage Perfect (octahedral)
Fracture Conchoidal
Hardness 10
Optic nature Isotropic
Refractive index 2.417
Birefringence None
Dispersion High, 0.044
Specific gravity 3.52
Lustre Adamantine
Pleochroism None