Gadolinium Gallium Garnet (GGG)

Color: Colorless, yellow, green, blue, pink, purple, red and orange

Moh’s Hardness: 7

Refractive Index: 1.97 - 2.02

Critical Angle: 30.51°

Specific Gravity: 7.02

Cleavage: None

Fracture: Conchoidal

Dispersion: Strong (.045)

Heat Sensitivity: Low

Birefringence (double refraction): None

Crystal Structure: Isometric

Treatments: None