Demantoid (Garnet)

 

Color: Green, Emerald Green

Moh’s Hardness: 6.5-7

Refractive Index: 1.88-1.89

Critical Angle: 32.13°

Specific Gravity: 3.82-3.85

Cleavage: Imperfect

Fracture: Subconchoidal

Heat Sensitivity: Yes

Birefringence (double refraction): 0.057

Crystal Structure: Isometric, rhombic, dodecahedron,icositetrahedron

 

Treatments: Generally none