Optical Properties
Luster
Vitreous, Resinous
Not Available
Pleochroism
Faint
Transparent crystals show a strong pleochroism: colorless light blue dark (violet) blueHerve Nicolas Lazzarelli
Dispersion
Not Available
0.01
26
Transparency
TransparentAnthony et al, Handbook of mineralogy (2001)
Transparent, Translucent
Refractive Index
1.827-1.879
1.604-1.646
Optic Character
Not Available
Not Available
Crystal System
Orthorhombic
monoclinic
Birefringence
0.042-0.051
0.031-0.036
Clarity
TransparentAnthony et al
Transparent
