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Willemite and Siderite Optical Properties


Optical Properties

Luster
Pearly  
Vitreous, Resinous  

Pleochroism
-  
-  

Dispersion
0.04  
36
0.17  
11

Transparency
Transparent, Translucent  
Transparent, Translucent  

Refractive Index
1.633-1.875  
1.687-1.723  

Optic Character
-  
-  

Crystal System
Trigonal  
Trigonal  

Birefringence
0.242  
0.028-0.030  

Clarity
Transparent  
Transparent  

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