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Agrellite
Austinite
Austinite and Agrellite Optical Properties


Optical Properties
Luster
Pearly  
Subadamantine, Silky  
Pleochroism
colorless.  
-  
Dispersion
0.01  
99+
0.03  
99+
Transparency
-  
-  
Refractive Index
1.567  
1.759  
Optic Character
-  
-  
Crystal System
Triclinic  
Orthorhombic  
Birefringence
0.014  
0.024  
Clarity
-  
-  
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