Luster
Vitreous
Waxy, Silky, Resinous, Greasy
Pleochroism
Weak: colorless -- very pale green -- very pale green
-
Transparency
TranslucentAnthony et al
TranslucentHerve Nicolas Lazzarelli
Refractive Index
1.662-1.723
1.530-1.575
Birefringence
-9999
-9999
Clarity
TranslucentAnthony et al
TranslucentHerve Nicolas Lazzarelli