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Onyx
Onyx

Neptunite
Neptunite



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Onyx
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Neptunite

Onyx and Neptunite Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous
Vitreous
1.2 Pleochroism
Not Available
x=yellow-orange
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Translucent, Opaque, Translucent to opaque
Translucent
1.5 Refractive Index
1.530-1.5431.692-1.734
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Trigonal
monoclinic
1.8 Birefringence
Not Available0.0294-0.0452
Achroite
0 0.296
1.9 Clarity
OpaqueHerve Nicolas Lazzarelli
Translucent

Onyx and Neptunite Optic Character

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

Onyx and Neptunite Transparency

Similar to their colors, Onyx and Neptunite 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.