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Cordierite Iolite
Ludlamite
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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