Luster
-
Vitreous
Pleochroism
-
-
Dispersion
0.020.01
0.005
1
👆🏻
Transparency
-
Opaque
Refractive Index
1.796-1.8411.540
1
3.25
👆🏻
Optic Character
-
-
Crystal System
-
Trigonal
Birefringence
0.045-9999
0
0.296
👆🏻
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
OpaqueHerve Nicolas Lazzarelli