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Onyx and Tanzanite Optical Properties


Tanzanite and Onyx Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
Not Available   
Present   

Dispersion
Not Available   
0.03   
14

Transparency
Translucent, Opaque, Translucent to opaque   
Transparent, Translucent, Transparent to translucent   

Refractive Index
1.530-1.543   
1.685-1.707   

Optic Character
Not Available   
Not Available   

Crystal System
Trigonal   
Orthorhombic   

Birefringence
Not Available   
0.006-0.018   

Clarity
OpaqueHerve Nicolas Lazzarelli   
TransparentUlrich Henn and Claudio C. Milisenda   

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Onyx and Tanzanite Optic Character

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

Similar to their colors, Onyx and Tanzanite 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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