Color: Emerald green, yellow-green, yellow

Moh’s Hardness: 6-7

Refractive Index: 1.655-1.68

Critical Angle: 37.31°

Specific Gravity: 3.16-3.20

Cleavage: perfect in 2 directions

Fracture: Uneven, very splintery

Dispersion: Medium (.017)

Heat Sensitivity: Yes

Birefringence (double refraction): Medium (.015)

Crystal Structure: Monoclinic