1 Optical Properties
1.1 Luster
Waxy, Silky, Resinous, Greasy
Vitreous
1.2 Pleochroism
1.3 Dispersion
1.4 Transparency
TranslucentHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Transparent, Opaque, Transparent to nearly opaque
1.5 Refractive Index
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
1.8 Birefringence
Not Available0.208-0.220
0
0.296
1.9 Clarity
TranslucentHerve Nicolas Lazzarelli
Transparent to nearly opaque