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Onyx and Inderite Optical Properties


Inderite and Onyx Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous, Pearly, Greasy   

Pleochroism
Not Available   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
Translucent, Opaque, Translucent to opaque   
Gemmological Tables (2004)   

Refractive Index
1.530-1.543   
1.488-1.505   

Optic Character
Not Available   
Biaxial/+   

Crystal System
Trigonal   
Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/a   

Birefringence
Not Available   
0.017   

Clarity
OpaqueHerve Nicolas Lazzarelli   
TransparentUlrich Henn and Claudio C. Milisenda   

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Onyx and Inderite Optic Character

Onyx and Inderite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Onyx and Inderite 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 Inderite 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. Inderite has Biaxial/+ character.

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Onyx and Inderite Transparency

Similar to their colors, Onyx and Inderite 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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