Luster
Sub-Adamantine, Vitreous
Vitreous
Pleochroism
X = pale blue; Y = blue; Z = Prussian blue
-
Dispersion
0.050.03
0.005
1
👆🏻
Transparency
Transparent
-
Refractive Index
1.809-1.8591.790-1.818
1
3.25
👆🏻
Optic Character
-
-
Crystal System
monoclinic
cubic
Birefringence
0.050-9999
0
0.296
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Clarity
Transparent
TransparentUlrich Henn and Claudio C. Milisenda