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Polyhalite
Afghanite
Afghanite and Polyhalite Optical Properties


Optical Properties
Luster
Vitreous, Resinous  
Vitreous  
Pleochroism
-  
-  
Dispersion
0.02  
99+
0.02  
99+
Transparency
-  
Transparent  
Refractive Index
1.546-1.548  
1.523  
Optic Character
-  
-  
Crystal System
Triclinic  
Trigonal  
Birefringence
0.021  
0.006  
Clarity
-  
Transparent  
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