Cubic Zirconium

Color: All ranges, including color changes

Moh’s Hardness: 8.25-8.5

Refractive index: 2.14-2.20

Critical Angle: 27.86°

Specific Gravity: 5.7

Cleavage: None

Fracture: Sub-conchoidal, brittle

Dispersion: Extremely strong (.06)

Heat Sensitivity: Low

Birefringence (double refraction): None

Crystal Structure: Isometric

Treatments: None