Synthetic cubic zirconia

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Synthetic cubic zirconia
Chemical composition Zirconium dioxide - ZrO2
Crystal system Cubic
Habit Columnar
Cleavage
Fracture
Hardness 8.25 - 8.5
Optic nature Isotropic
Refractive index 2.171 - 2.177
Birefringence None
Dispersion High, 0.059 - 0.065
Specific gravity 5.65 - 5.95
Lustre
Pleochroism None