Luster
Vitreous, Adamantine
Vitreous
Pleochroism
Strong: purplish-red
Common trichroism: light green
Dispersion
0.020.02
0.005
1
👆🏻
Transparency
Transparent, Translucent, Transparent to opaque
-
Refractive Index
1.762-1.7781.668-1.703
1
3.25
👆🏻
Optic Character
-
-
Crystal System
Trigonal
monoclinic
Birefringence
0.0080.024-0.030
0
0.296
👆🏻
Clarity
Transparent
-