Luster
Vitreous, Adamantine, Pearly
Vitreous, Adamantine
Transparency
-
Transparent, Translucent, Transparent to opaque
Refractive Index
1.552-1.562
1.762-1.788
Crystal System
monoclinic
Trigonal
Birefringence
0.009
0.008-0.009
Clarity
TransparentUlrich Henn and Claudio C. Milisenda
Transparent