Optical Properties
Luster
Vitreous, Greasy
Vitreous, Vitreous, Waxy
Pleochroism
Weak: pale yellow yellow
AbsentWalter Schumann
Dispersion
0.02
22
None
Transparency
Gemmological Tables (2004) More from other references
Translucent, Translucent, Opaque, Translucent to nearly opaque
Refractive Index
1.627-1.639
1.530-1.543
Optic Character
Biaxial/+
Not Available
Crystal System
Orthorhombic
Trigonal
Birefringence
0.006
0.004
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
Translucent
