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Precious Opal
Precious Opal

Apatite
Apatite



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Precious Opal
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Apatite
Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

 
-
-
0.01
Transparent, Translucent
1.370-1.470
-
-
-9999
Transparent
 
Vitreous
Blue stones – strong
0.01
-
1.628-1.651
-
Hexagonal
0.002-0.008
TransparentUlrich Henn and Claudio C. Milisenda