Luster
Adamantine
Vitreous, Subadamantine, Silky
Pleochroism
None
Colourless to pale brown to yellow
Transparency
Transparent, Translucent, Transparent to opaque
Transparent, Translucent
Refractive Index
2.417-2.419
1.653-1.685
Crystal System
cubic
Orthorhombic
Birefringence
-9999
0.020-0.022
Clarity
Transparent
Transparent