Onyx and Chlorapatite Optical Properties

Onyx

Chlorapatite

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1 Optical Properties

1.1 Luster

Vitreous

Not Available

1.2 Pleochroism

Not Available

Weak to moderate; in pale colors.Anthony et al

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Translucent, Opaque, Translucent to opaque

Transparent

1.5 Refractive Index

1.530-1.5431.665-1.667

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

Transparent

Onyx and Chlorapatite Optic Character

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

Similar to their colors, Onyx and Chlorapatite 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.