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Onyx
Onyx

Rock Crystal
Rock Crystal



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X
Onyx
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Rock Crystal

Onyx and Rock Crystal Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous
Not Available
1.2 Pleochroism
Not Available
AbsentWalter Schumann
1.3 Dispersion
NA0.01
Fluorite Optical Properties
0.007 1
1.4 Transparency
Translucent, Opaque, Translucent to opaque
TransparentWalter Schumann, Gemstones of the world (2001) More from other references
1.5 Refractive Index
1.530-1.5431.544-1.553
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Trigonal
Not Available
1.8 Birefringence
Not Available0.009
Achroite
0 0.296
1.9 Clarity
OpaqueHerve Nicolas Lazzarelli
TransparentWalter Schumann

Onyx and Rock Crystal Optic Character

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

Similar to their colors, Onyx and Rock Crystal 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.