Onyx and Hibonite Optical Properties

Onyx

Hibonite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Not Available

O = brownish gray; E = gray

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Translucent, Opaque, Translucent to opaque

Handbook of mineralogy (2001)

1.5 Refractive Index

1.530-1.5431.79-1.807

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Hexagonal

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

Handbook of mineralogy (2001)

Onyx and Hibonite Optic Character

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

Similar to their colors, Onyx and Hibonite 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.