Optical Properties
Luster
Vitreous
Not Available
Pleochroism
Not Available
Strong dichroism: blue to colourless\
Dispersion
Not Available
Not Available
Transparency
Translucent, Opaque, Translucent to opaque
Transparent
Refractive Index
1.530-1.543
1.560-1.604
Optic Character
Not Available
Not Available
Crystal System
Trigonal
Not Available
Birefringence
Not Available
0.003-0.010
Clarity
OpaqueHerve Nicolas Lazzarelli
Transparent
