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Ludlamite and Cordierite Iolite Optical Properties


Optical Properties

Luster
Vitreous  
Vitreous, Pearly  

Pleochroism
Strong trichroism: colorless to yellowish  
-  

Dispersion
0.02  
99+
0.02  
99+

Transparency
Transparent  
-  

Refractive Index
1.542-1.578  
1.653-1.693  

Optic Character
Biaxial/+  
-  

Crystal System
-  
monoclinic  

Birefringence
0.008-0.012  
0.038-0.044  

Clarity
Transparent  
TransparentUlrich Henn and Claudio C. Milisenda  

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