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Mottramite
Apatite
Apatite and Mottramite Optical Properties


Optical Properties
Luster
Greasy  
Vitreous  
Pleochroism
Visible X=Y= canary yellow to greenish yellow  
Blue stones – strong  
Dispersion
0.04  
36
0.01  
99+
Transparency
-  
-  
Refractive Index
2.170  
1.628-1.651  
Optic Character
-  
-  
Crystal System
Orthorhombic  
Hexagonal  
Birefringence
0.150  
0.002-0.008  
Clarity
-  
TransparentUlrich Henn and Claudio C. Milisenda  
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