Optical Properties
Luster
Vitreous, Greasy
Vitreous
Pleochroism
Weak
AbsentWalter Schumann
Dispersion
Not Available
Not Available
Transparency
Not Available
Gemmological Tables (2004)
Refractive Index
1.672-1.676
1.735-1.790
Optic Character
Not Available
Not Available
Crystal System
Orthorhombic
Isometric
Birefringence
0.019-0.021
Not Available
Clarity
Not Available
TransparentUlrich Henn and Claudio C. Milisenda
