Luster
Vitreous, Pearly
Vitreous, Silky
Pleochroism
-
X = blue
Dispersion
0.020.02
0.005
1
👆🏻
Transparency
-
-
Refractive Index
1.653-1.6931.680-1.698
1
3.25
👆🏻
Optic Character
-
-
Crystal System
monoclinic
monoclinic
Birefringence
0.038-0.0440.005-0.008
0
0.296
👆🏻
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
-