Luster
Vitreous
Vitreous
Pleochroism
Distinct trichroism: yellow green green blue greenHerve Nicolas Lazzarelli
Weak: pink pale pinkHerve Nicolas Lazzarelli
Dispersion
0.020.01
0.005
1
👆🏻
Transparency
Transparent
Transparent, Translucent, Transparent to translucent
Refractive Index
1.657-1.6811.544-1.553
1
3.25
👆🏻
Optic Character
-
-
Crystal System
monoclinic
Hexagonal
Birefringence
0.014-0.0160.009
0
0.296
👆🏻
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
TranslucentHerve Nicolas Lazzarelli