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Common Opal
Piemontite
Piemontite and Common Opal Optical Properties


Optical Properties
Luster
-  
Vitreous  
Pleochroism
-  
visible  
Dispersion
0.01  
99+
0.02  
99+
Transparency
Translucent  
-  
Refractive Index
1.37-1.52  
1.725-1.756  
Optic Character
-  
-  
Crystal System
-  
monoclinic  
Birefringence
-9999  
0.025-0.076  
Clarity
Translucent  
-  
Benefits >>
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