Optical Properties
Luster
Vitreous
Vitreous
Pleochroism
NilArthur Thomas
Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue
Dispersion
0.02
23
None
Transparency
Transparent
Translucent, Translucent to opaque
Refractive Index
1.621-1.675
1.669-1.723
Optic Character
Not Available
Not Available
Crystal System
monoclinic
Orthorhombic
Birefringence
0.044
0.011-0.037
Clarity
Transparent
Translucent
