1 Optical Properties
1.1 Luster
Adamantine
Waxy, Silky, Resinous, Greasy
1.2 Pleochroism
1.3 Dispersion
1.4 Transparency
Gemmological Tables (2004)
TranslucentHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
1.5 Refractive Index
1.880-1.8901.530-1.575
1
3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
1.8 Birefringence
Not AvailableNot Available
0
0.296
1.9 Clarity
TransparentUlrich Henn and Claudio C. Milisenda
TranslucentHerve Nicolas Lazzarelli