Onyx and Williamsite Optical Properties

Onyx

Williamsite

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Optical Properties

Luster

Vitreous

Waxy, Silky, Resinous, Greasy

Pleochroism

Dispersion

0.010.03

0.005 1

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Transparency

Translucent, Opaque, Translucent to opaque

TranslucentHerve Nicolas Lazzarelli

Refractive Index

1.530-1.5431.530-1.575

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

TranslucentHerve Nicolas Lazzarelli

Onyx and Williamsite Optic Character

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

Similar to their colors, Onyx and Williamsite 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.