Optical Properties
Luster
Vitreous
Vitreous, Adamantine, Vitreous, Adamantine
Pleochroism
AbsentWalter Schumann
Strong
Dispersion
None
0.02
21
Transparency
Translucent, Translucent to opaque
Transparent, Translucent, Transparent to opaque
Refractive Index
1.600-1.688
1.762-1.788
Optic Character
Not Available
Not Available
Crystal System
monoclinic
Trigonal
Birefringence
0.020-0.027
0.008-0.009
Clarity
Translucent
Transparent
