Onyx and Pyrope Optical Properties

Onyx

Pyrope

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Optical Properties

Luster

Vitreous

Greasy, Vitreous

Pleochroism

None

Dispersion

0.010.02

0.005 1

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Transparency

Translucent, Opaque, Translucent to opaque

Refractive Index

1.530-1.5431.720-1.756

1 3.25

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Optic Character

Crystal System

Trigonal

cubic

Birefringence

-9999-9999

0 0.296

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Clarity

OpaqueHerve Nicolas Lazzarelli

TransparentUlrich Henn and Claudio C. Milisenda

Onyx and Pyrope Optic Character

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

Similar to their colors, Onyx and Pyrope 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.