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Onyx and Jasper Optical Properties


Jasper and Onyx Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
Not Available   
AbsentWalter Schumann   

Dispersion
Not Available   
None   

Transparency
Translucent, Opaque, Translucent to opaque   
Opaque   

Refractive Index
1.530-1.543   
1.540   

Optic Character
Not Available   
Not Available   

Crystal System
Trigonal   
Trigonal   

Birefringence
Not Available   
Not Available   

Clarity
OpaqueHerve Nicolas Lazzarelli   
OpaqueHerve Nicolas Lazzarelli   

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Onyx and Jasper Optic Character

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

Similar to their colors, Onyx and Jasper 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, Onyx is Opaque, Translucent and Translucent to opaque while Onyx is Opaque, Translucent and Translucent to opaque in appearance.

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