Almandine (Garnet)

 

Color: Red with a violet tint, red with an orange tint

Moh’s Hardness: 7.5

Refractive Index: 1.78-1.81

Critical Angle: 34.18°

Specific Gravity: 3.95-4.20

Cleavage: Imperfect

Fracture: Subconchoidal, can be brittle

Heat Sensitivity: Slightly, but tiny flaws, bubbles and cracks are common and can be aggravated by heat during the dopping process

Birefringence (double refraction): 0.024

Crystal Structure: Isometric, rhombic, dodecahedron,icositetrahedron

 

Treatments: Generally none