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Neptunite
Neptunite

Bytownite
Bytownite



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Neptunite
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Bytownite
Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

 
Vitreous
x=yellow-orange
0.03
Translucent
1.692-1.734
-
monoclinic
0.0294-0.0452
Translucent
 
Vitreous, Pearly
colorless.
0.01
Transparent
1.561-1.583
-
Triclinic
0.010-0.011
Transparent