Optical Properties
Luster
Vitreous, Pearly
Vitreous, Resinous
Pleochroism
weak to none
Strong
Dispersion
0.01
26
0.03
14
Transparency
Gemmological Tables (2004) More from other references
Gemmological Tables (2004) More from other references
Refractive Index
1.578-1.646
1.729-1.768
Optic Character
Biaxial/+
Not Available
Crystal System
Triclinic
monoclinic
Birefringence
0.020-0.030
0.019-0.046
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
TransparentUlrich Henn and Claudio C. Milisenda
