Optical Properties
Luster
Vitreous, Vitreous, Waxy
Vitreous
Pleochroism
AbsentWalter Schumann
NilArthur Thomas
Dispersion
None
Not Available
Transparency
Translucent, Translucent, Opaque, Translucent to nearly opaque
Transparent
Refractive Index
1.530-1.543
1.708-1.722
Optic Character
Not Available
Biaxial/+
Crystal System
Trigonal
Orthorhombic
Birefringence
0.004
0.031-0.050
Clarity
Translucent
Transparent
