Moldavite

Color: Bottle-green to olive green

Moh’s Hardness: 5.5

Refractive Index: 1.48-1.50

Critical Angle: 42.51°

Specific Gravity: 2.32-2.38

Cleavage: None

Fracture: Conchoidal

Heat Sensitivity: Low

Birefringence (double refraction): None

Crystal Structure: Amorphous

Treatments: Generally none