Optical Properties
Luster
Vitreous
Vitreous, Resinous
Pleochroism
Not Available
Faint
Dispersion
Not Available
Not Available
Transparency
Translucent, Opaque, Translucent to opaque
TransparentAnthony et al, Handbook of mineralogy (2001)
Refractive Index
1.530-1.543
1.827-1.879
Optic Character
Not Available
Not Available
Crystal System
Trigonal
Orthorhombic
Birefringence
Not Available
0.042-0.051
Clarity
OpaqueHerve Nicolas Lazzarelli
TransparentAnthony et al
