Luster
Vitreous
Waxy, Silky, Resinous, Greasy
Pleochroism
Very strong: pale yellow colorless
-
Transparency
Transparent
TranslucentHerve Nicolas Lazzarelli
Refractive Index
1.614-1.666
1.530-1.575
Crystal System
Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
-
Birefringence
0.014-0.032
-9999
Clarity
Transparent
TranslucentHerve Nicolas Lazzarelli