Optical Properties
Luster
Vitreous, Resinous
Fibrous
Pleochroism
StrongArthur Thomas
Not Available
Dispersion
Not Available
Not Available
Transparency
Transparent, Translucent
Gemmological Tables (2004)
Refractive Index
1.525-1.686
1.674-1.764
Optic Character
Not Available
Not Available
Crystal System
Orthorhombic
monoclinic
Birefringence
0.155
0.014-0.016
Clarity
Transparent
OpaqueUlrich Henn and Claudio C. Milisenda
