Optical Properties
Luster
Adamantine, Vitreous, Silky, Fibrous
Not Available
Pleochroism
Not Available
AbsentWalter Schumann
Dispersion
None
None
Transparency
Opaque
Translucent
Refractive Index
1.655-1.909
1.37-1.52
Optic Character
Not Available
Not Available
Crystal System
monoclinic
Not Available
Birefringence
0.254
Not Available
Clarity
Gemmological Tables (2004) More from other references
Translucent
