1 Optical Properties
1.1 Luster
Vitreous
Greasy, Subadamantine
1.2 Pleochroism
Strong
In deeply colored specimens: blue greenAnthony et al
1.3 Dispersion
1.9 Transparency
Gemmological Tables (2004) More from other references
Transparent
1.10 Refractive Index
1.656-1.7041.974-1.984
1
3.25
1.5 Optic Character
1.6 Crystal System
1.7 Birefringence
0.009-0.012Not Available
0
0.296
1.12 Clarity
TransparentUlrich Henn and Claudio C. Milisenda
Transparent