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Opal
Lepidocrocite
Lepidocrocite and Opal Optical Properties


Optical Properties
Luster
Vitreous, Pearly  
-  
Pleochroism
None  
Strong; X = colorless to yellow; Y = orange  
Dispersion
0.01  
99+
0.02  
99+
Transparency
Transparent, Translucent, Transparent to translucent  
-  
Refractive Index
1.37-1.52  
1.940  
Optic Character
-  
-  
Crystal System
Trigonal  
Orthorhombic  
Birefringence
-9999  
-9999  
Clarity
Transparent  
-  
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Semi Precious Gemstones

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