Luster
Vitreous
-
Pleochroism
Blue stones – strong
-
Dispersion
0.01-
0.005
1
👆🏻
Transparency
-
-
Refractive Index
1.628-1.6511.68-1.75
1
3.25
👆🏻
Optic Character
-
-
Crystal System
Hexagonal
-
Birefringence
0.002-0.008-9999
0
0.296
👆🏻
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
-