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Siderite
Willemite
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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