Luster
Vitreous
Vitreous
Pleochroism
Weak: pink pale pinkHerve Nicolas Lazzarelli
Present
Dispersion
0.010.02
0.005
1
👆🏻
Transparency
Transparent, Translucent, Transparent to translucent
Opaque, Translucent, Opaque . May be translucent in thin backlit sections.
Refractive Index
1.544-1.5531.695
1
3.25
👆🏻
Optic Character
-
-
Crystal System
Hexagonal
Orthorhombic
Birefringence
0.0090.006-0.018
0
0.296
👆🏻
Clarity
TranslucentHerve Nicolas Lazzarelli
OpaqueHerve Nicolas Lazzarelli