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Andalusite and Onyx Optical Properties


Onyx and Andalusite Optical Properties


Optical Properties

Luster
Vitreous, Greasy   
Vitreous   

Pleochroism
strongly trichroic   
Not Available   

Dispersion
0.02   
23
Not Available   

Transparency
Transparent, Translucent   
Translucent, Opaque, Translucent to opaque   

Refractive Index
1.627-1.650   
1.530-1.543   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Trigonal   

Birefringence
0.009-0.010   
Not Available   

Clarity
Transparent   
OpaqueHerve Nicolas Lazzarelli   

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Andalusite and Onyx Optic Character

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

Similar to their colors, Andalusite and Onyx 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, Andalusite is Translucent and Transparent while Andalusite is Translucent and Transparent in appearance.

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