Onyx and Moldavite Optical Properties

Onyx

Moldavite

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Optical Properties

Luster

Vitreous

Pleochroism

Absent

Dispersion

0.010.04

0.005 1

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Transparency

Translucent, Opaque, Translucent to opaque

Transparent, Translucent

Refractive Index

1.530-1.5431.48-1.54

1 3.25

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Optic Character

Crystal System

Trigonal

Birefringence

-9999-9999

0 0.296

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Clarity

OpaqueHerve Nicolas Lazzarelli

Transparent

Onyx and Moldavite Optic Character

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

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