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Neptunite
Pyrophyllite
Pyrophyllite and Neptunite Optical Properties


Optical Properties
Luster
Vitreous  
Pearly  
Pleochroism
x=yellow-orange  
-  
Dispersion
0.03  
99+
0.05  
29
Transparency
Translucent  
Translucent  
Refractive Index
1.692-1.734  
1.534-1.601  
Optic Character
-  
-  
Crystal System
monoclinic  
-  
Birefringence
0.0294-0.0452  
0.050  
Clarity
Translucent  
Translucent  
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