Luster
Vitreous
Vitreous, Greasy
Pleochroism
Very strong: pale yellow colorless
X golden yellow to orange
Dispersion
0.020.02
0.005
1
👆🏻
Transparency
Transparent
Transparent, Translucent
Refractive Index
1.614-1.6661.589-1.670
1
3.25
👆🏻
Optic Character
-
-
Crystal System
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
monoclinic
Birefringence
0.014-0.0320.027-0.032
0
0.296
👆🏻
Clarity
Transparent
Transparent