Luster
Not Available
Not Available
Pleochroism
Not Available
Sometimes strongArthur Thomas
Dispersion
Not Available
Not Available
Transparency
Not Available
TransparentWalter Schumann, Gemstones of the world (2001) More from other references
Refractive Index
Not Available
2.19-2.34
Optic Character
Not Available
Not Available
Crystal System
Not Available
Not Available
Birefringence
Not Available
0.015
Clarity
Not Available
TransparentWalter Schumann