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Apatite
Apatite

Omphacite
Omphacite



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Apatite
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Omphacite

Apatite and Omphacite Optical Properties

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Optical Properties

Luster

Pleochroism

Dispersion

Transparency

Refractive Index

Optic Character

Crystal System

Birefringence

Clarity

 
Vitreous
Blue stones – strong
0.01
-
1.628-1.651
-
Hexagonal
0.002-0.008
TransparentUlrich Henn and Claudio C. Milisenda
 
Vitreous
Weak: colorless -- very pale green -- very pale green
0.02
TranslucentAnthony et al
1.662-1.723
-
-
-9999
TranslucentAnthony et al

Apatite and Omphacite Optic Character

Apatite and Omphacite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Apatite Vs Omphacite like crystallographic symmetry, pleochroism,etc. in the crystal. Some of the optical properties are refractive index, luster, optic character, pleochroism etc. Prominent among these is Apatite and Omphacite optic character. You might have noticed your gemologist rotating the gemstone while testing it. Rotating a gemstone along its optic axis helps in determining its optic character.

Apatite and Omphacite Transparency

Similar to their colors, Apatite and Omphacite transparency can also be used as criteria for their primary identification. Although transparency cannot be the only criteria for gemstone identification, it can efficiently used in gemstone grading. Talking about their transparency, Apatite is while Apatite is in appearance.