Onyx and Erythrite Optical Properties

Onyx

Erythrite

Add ⊕

Optical Properties

Luster

Vitreous

Subadamantine, Pearly

Pleochroism

Visible: X = pale pinkish to pale rose; Y = pale violet to pale violet-rose; Z = deep red

Dispersion

0.010.03

0.005 1

👆🏻

Transparency

Translucent, Opaque, Translucent to opaque

Refractive Index

1.530-1.5431.626-1.629

1 3.25

👆🏻

Optic Character

Crystal System

Trigonal

monoclinic

Birefringence

-9999-9999

0 0.296

👆🏻

Clarity

OpaqueHerve Nicolas Lazzarelli

Onyx and Erythrite Optic Character

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

Compare Gems for Capricorn » More

Onyx Vs Aqua Aura

Onyx Vs Hawks Eye

Onyx Vs Crystal Quartz

» More Compare Gems for Capricorn

Onyx and Erythrite Transparency

Similar to their colors, Onyx and Erythrite 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.