Luster
Vitreous
Vitreous
Pleochroism
Strong
-
Dispersion
0.020.01
0.005
1
👆🏻
Transparency
-
Opaque
Refractive Index
1.656-1.7041.540
1
3.25
👆🏻
Optic Character
Biaxial/+
-
Crystal System
Triclinic
Trigonal
Birefringence
0.009-0.012-9999
0
0.296
👆🏻
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
OpaqueHerve Nicolas Lazzarelli