1 Optical Properties
1.1 Luster
Not Available
Not Available
1.2 Pleochroism
AbsentWalter Schumann
Strong: dark blue light blueWalter Schumann
1.3 Dispersion
1.5 Transparency
TransparentWalter Schumann, Gemstones of the world (2001) More from other references
Transparent, Translucent
1.6 Refractive Index
1.544-1.5531.614-1.666
1
3.25
1.12 Optic Character
Not Available
Not Available
1.13 Crystal System
Not Available
Not Available
1.14 Birefringence
1.19 Clarity
TransparentWalter Schumann
Transparent