Optical Properties
Luster
Vitreous
Vitreous, Resinous
Pleochroism
Blue stones – strong
Pale green
Dispersion
0.01
27
Not Available
Transparency
Gemmological Tables (2004) More from other references
Transparent, Translucent
Refractive Index
1.628-1.651
1.671-1.774
Optic Character
Not Available
Not Available
Crystal System
Hexagonal
Monoclinic Prismatic H-M Symbol (2/m) Space Group: C 2/c
Birefringence
0.002-0.008
Not Available
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
Transparent
