Optical Properties
Luster
Vitreous, Pearly
Vitreous, Vitreous, Waxy
Pleochroism
Not Available
AbsentWalter Schumann
Dispersion
Not Available
None
Transparency
Not Available
Translucent, Translucent, Opaque, Translucent to nearly opaque
Refractive Index
1.530-1.536
1.530-1.543
Optic Character
Not Available
Not Available
Crystal System
tetragonal
Trigonal
Birefringence
Not Available
0.004
Clarity
Not Available
Translucent
