Optical Properties
Luster
Vitreous, Greasy
Not Available
Pleochroism
Weak: pale yellow yellow
Strong: dark blue light blueWalter Schumann
Dispersion
0.02
22
0.02
22
Transparency
Gemmological Tables (2004) More from other references
Transparent, Translucent
Refractive Index
1.627-1.639
1.614-1.666
Optic Character
Biaxial/+
Not Available
Crystal System
Orthorhombic
Not Available
Birefringence
0.006
0.014-0.040
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
Transparent
