Elbiate Tourmaline

Color: Green/red/pink, watermelon (green outside red inside like the fruit)

Moh’s hardness: 7-7.5

Refractive Index: 1.616-1.652

Critical Angle: 38.23°

Specific Gravity: 3.02-3.26

Cleavage: None

Fracture: Uneven, small conchoidal

Dispersion: Medium (.017)

Heat Sensitivity: Moderate

Dichroic: Strong (many color variations)

Birefringence (double refraction): Medium (.014-.024)

Crystal Structure: Hexagonal

Treatments: Generally there is no treatments with this kind of rough.