Luster
Vitreous
-
Pleochroism
Very weak: light green pale greenWalter Schumann
Strong: dark red pinkish-redHerve Nicolas Lazzarelli
Dispersion
0.010.02
0.005
1
👆🏻
Transparency
Transparent, Translucent
Transparent, Translucent
Refractive Index
1.544-1.5531.614-1.666
1
3.25
👆🏻
Optic Character
-
-
Crystal System
Trigonal
-
Birefringence
0.0090.014-0.040
0
0.296
👆🏻
Clarity
Transparent
Transparent