Optical Properties
Luster
Silky
Waxy
Pleochroism
X = very pale blue; Y = pale blue; Z = deep blue
Not Available
Dispersion
Not Available
Not Available
Transparency
Translucent
Translucent
Refractive Index
1.752-1.815
1.530-1.543
Optic Character
Not Available
Not Available
Crystal System
Orthorhombic
Not Available
Birefringence
0.063
0.003-0.009
Clarity
Translucent
Translucent
