Mohs Hardness: 7 to 7.5 out of 10
Color: Intense, vivid neon blue to green (color caused by copper impurities)
RI: 1.603 to 1.655 (+/-0.005)
Birefringence: 0.013 to 0.024
Clarity Type: Type II
Optic Character: Uniaxial negative
Pleochroism: Medium to strong, usually two tones of the gem's body color.
Spectrum: Not diagnostic
Fluorescence: Not diagnostic. Inert or weak to moderate bluish white under LW.
SG: 2.84 to 3.10 (3.05 Average)