Optical Properties
Luster
Vitreous
Vitreous
Pleochroism
Blue stones strong trichroism: colorless/pale blue (greenish or violet)-blue dark blueHerve Nicolas Lazzarelli
Absent
Dispersion
0.02
18
None
Transparency
Transparent
Transparent, Translucent
Refractive Index
1.710-1.735
1.48-1.54
Optic Character
Biaxial/+
Not Available
Crystal System
Not Available
Amorphous
Birefringence
0.012-0.033
Not Available
Clarity
Transparent
Transparent
