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Onyx and Euclase Optical Properties


Euclase and Onyx Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
Not Available   
Weak: colorless-(greenish) yellow   

Dispersion
Not Available   
0.02   
23

Transparency
Translucent, Opaque, Translucent to opaque   
Gemmological Tables (2004) More from other references   

Refractive Index
1.530-1.543   
1.650-1.677   

Optic Character
Not Available   
Not Available   

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

Birefringence
Not Available   
0.019-0.025   

Clarity
OpaqueHerve Nicolas Lazzarelli   
TransparentUlrich Henn and Claudio C. Milisenda   

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Onyx and Euclase Optic Character

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

Similar to their colors, Onyx and Euclase 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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