Luster
Vitreous
Vitreous, Pearly
Pleochroism
Strong: dark brown light brownAnthony et al
-
Dispersion
0.010.01
0.005
1
👆🏻
Transparency
Transparent
Translucent
Refractive Index
-99991.620-1.850
1
3.25
👆🏻
Optic Character
-
-
Crystal System
-
Trigonal
Birefringence
-99990.223-0.227
0
0.296
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Clarity
Transparent
Translucent