Gadolinium gallium garnet
-GGG (gadolinium gallium oxide)
Color: Colorless, yellow, green, blue, pink,
purple, red and orange.
Moh’s hardness: 7
Refractive index: 1.97
Critical angle: 30.5°
Specific gravity: 7.02
Cleavage: None
Fracture: Conchoidal
Dispersion: Strong (.045)
Heat sensitivity: Low
Pleochroism: None
Birefringence (double refraction): None
Crystal structure: Isometric
Treatments: Synthetic material.
Cutting: Cuts and polishes like
garnet.
Polishing: Polishes easily on
tin or tin alloy laps with alumina, or diamond.
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