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Apatite and Andradite Optical Properties


Andradite and Apatite Optical Properties


Optical Properties

Luster
Vitreous   
Adamantine, Resinous   

Pleochroism
Blue stones – strong   
Not Available   

Dispersion
0.01   
27
0.06   
7

Transparency
Gemmological Tables (2004) More from other references   
Transparent   

Refractive Index
1.628-1.651   
1.88-1.94   

Optic Character
Not Available   
Not Available   

Crystal System
Hexagonal   
cubic   

Birefringence
0.002-0.008   
0.057   

Clarity
TransparentUlrich Henn and Claudio C. Milisenda   
Transparent   

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Apatite and Andradite Optic Character

Apatite and Andradite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Apatite and Andradite Physical Properties 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 Andradite 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.

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Apatite and Andradite Transparency

Similar to their colors, Apatite and Andradite 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 Gemmological Tables (2004) More from other references while Apatite is Gemmological Tables (2004) More from other references in appearance.

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