Luster
Vitreous
Pleochroism
Blue stones – strong
Dispersion
0.01
Rank: 59 (Overall)
0.005
1
👆🏻
Transparency
-
Refractive Index
1.628-1.651
1
3.25
👆🏻
Optic Character
-
Crystal System
Hexagonal
Birefringence
0.002-0.008
0
0.296
👆🏻
Clarity
TransparentUlrich Henn and Claudio C. Milisenda