Luster
Vitreous
Vitreous
Pleochroism
Present
Weak: pink pale pinkHerve Nicolas Lazzarelli
Dispersion
0.020.01
0.005
1
👆🏻
Transparency
Opaque, Translucent, Opaque . May be translucent in thin backlit sections.
Transparent, Translucent, Transparent to translucent
Refractive Index
1.6951.544-1.553
1
3.25
👆🏻
Optic Character
-
-
Crystal System
Orthorhombic
Hexagonal
Birefringence
0.006-0.0180.009
0
0.296
👆🏻
Clarity
OpaqueHerve Nicolas Lazzarelli
TranslucentHerve Nicolas Lazzarelli