Optical Properties
Luster
Vitreous, Pearly
Not Available
Pleochroism
AbsentWalter Schumann
Definite: brown reddish-brownWalter Schumann
Dispersion
0.01
25
0.01
27
Transparency
Gemmological Tables (2004) More from other references
Transparent, Translucent
Refractive Index
1.502-1.523
1.544-1.553
Optic Character
Not Available
Not Available
Crystal System
monoclinic
Not Available
Birefringence
0.012-0.016
0.009
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
Transparent
