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Demantoid and Apatite Optical Properties


Apatite and Demantoid Optical Properties


Optical Properties

Luster
Adamantine   
Vitreous   

Pleochroism
None   
Blue stones – strong   

Dispersion
Not Available   
0.01   
27

Transparency
Gemmological Tables (2004)   
Gemmological Tables (2004) More from other references   

Refractive Index
1.880-1.890   
1.628-1.651   

Optic Character
Not Available   
Not Available   

Crystal System
cubic   
Hexagonal   

Birefringence
Not Available   
0.002-0.008   

Clarity
TransparentUlrich Henn and Claudio C. Milisenda   
TransparentUlrich Henn and Claudio C. Milisenda   

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Demantoid and Apatite Optic Character

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

Similar to their colors, Demantoid and Apatite 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, Demantoid is Gemmological Tables (2004) while Demantoid is Gemmological Tables (2004) in appearance.

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Green Gemstones


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