1 Optical Properties
1.1 Luster
Not Available
Waxy, Silky, Resinous, Greasy
1.2 Pleochroism
Colorless blueAnthony et al
Not Available
1.3 Dispersion
1.4 Transparency
Gemmological Tables (2004) More from other references
TranslucentHerve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
1.5 Refractive Index
1.639-1.6801.530-1.575
1
3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Not Available
Not Available
1.8 Birefringence
0.041Not Available
0
0.296
1.9 Clarity
TransparentUlrich Henn and Claudio C. Milisenda
TranslucentHerve Nicolas Lazzarelli