Luster
-
Sub-Adamantine, Vitreous
Pleochroism
-
X = pale blue; Y = blue; Z = Prussian blue
Dispersion
0.020.05
0.005
1
👆🏻
Transparency
-
Transparent
Refractive Index
1.796-1.8411.809-1.859
1
3.25
👆🏻
Optic Character
-
-
Crystal System
-
monoclinic
Birefringence
0.0450.050
0
0.296
👆🏻
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
Transparent