Onyx and Kyanite Optical Properties

Onyx

Kyanite

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1 Optical Properties

1.1 Luster

Vitreous

Vitreous, Pearly

1.2 Pleochroism

Not Available

Trichroic

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Translucent, Opaque, Translucent to opaque

Not Available

1.5 Refractive Index

1.530-1.5431.71-1.74

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Triclinic

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

Color grading system

Onyx and Kyanite Optic Character

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

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