Luster
Vitreous
Pleochroism
Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue
Dispersion
0.01
Rank: 59 (Overall)
0.005
1
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Transparency
Translucent, Translucent to opaque
Refractive Index
1.669-1.723
1
3.25
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Optic Character
-
Crystal System
Orthorhombic
Birefringence
0.011-0.037
0
0.296
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Clarity
Translucent