1 Optical Properties
1.1 Luster
Waxy, Silky, Resinous, Greasy
Not Available
1.2 Pleochroism
Not Available
Not Available
1.3 Dispersion
1.4 Transparency
TranslucentHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Gemstones of the world (2001)
1.5 Refractive Index
1.530-1.5751.534-1.540
1
3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Not Available
Not Available
1.8 Birefringence
Not AvailableNot Available
0
0.296
1.9 Clarity
TranslucentHerve Nicolas Lazzarelli
Gemstones of the world (2001)