Onyx and Imperial Topaz Optical Properties

Onyx

Imperial Topaz

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1 Optical Properties

1.1 Luster

Vitreous

Not Available

1.2 Pleochroism

Not Available

1.3 Dispersion

NA0.01

0.007 1

1.4 Transparency

Translucent, Opaque, Translucent to opaque

Transparent

1.5 Refractive Index

1.530-1.5431.609-1.643

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Not Available

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

Not Available

Onyx and Imperial Topaz Optic Character

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

Similar to their colors, Onyx and Imperial Topaz 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.