Luster
Waxy
Vitreous
Pleochroism
Weak
None
Dispersion
0.030.01
0.005
1
👆🏻
Transparency
Translucent, Opaque
Transparent, Transparent to translucent
Refractive Index
1.610-1.6501.544-1.553
1
3.25
👆🏻
Optic Character
-
-
Crystal System
Triclinic
Trigonal
Birefringence
0.0400.009
0
0.296
👆🏻
Clarity
Translucent
Transparent