Spessartite (Garnet)

Color: Orange to red brown

Moh’s Hardness: 7-7.5

Refractive Index: 1.79-1.81

Critical Angle: 33.96°

Specific Gravity: 4.12-4.20

Cleavage: Imperfect

Fracture: Subconchoidal

Heat Sensitivity: Slightly

Birefringence (double refraction): 0.027

Crystal Structure: Isometric, rhombic, dodecahedron,icositetrahedron

Treatments: Generally none