Luster
Vitreous
Greasy, Vitreous
Pleochroism
Strong dichroism: yellow green Lazzarelli
None
Transparency
Transparent, Translucent, Transparent to translucent
-
Refractive Index
1.565-1.602
1.760
Crystal System
Hexagonal
cubic
Birefringence
0.0040-0.0070
0.010-0.014
Clarity
-
TransparentUlrich Henn and Claudio C. Milisenda