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Datolite
Nepheline
Nepheline and Datolite Optical Properties


Optical Properties
Luster
Vitreous  
Vitreous, Greasy  
Pleochroism
-  
-  
Dispersion
0.02  
99+
0.01  
99+
Transparency
Transparent  
Transparent, Translucent  
Refractive Index
1.621-1.675  
1.529-1.547  
Optic Character
-  
-  
Crystal System
monoclinic  
Hexagonal  
Birefringence
0.044  
0.003-0.004  
Clarity
Transparent  
Transparent  
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