Opal and Cacoxenite Optical Properties

Opal

Cacoxenite

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Optical Properties

Luster

Vitreous, Pearly

Silky

Pleochroism

None

visible: O = Pale yellow E = Canary yellow to yellow orange

Dispersion

0.010.03

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

Refractive Index

1.37-1.521.575-1.585

1 3.25

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Optic Character

Crystal System

Trigonal

Hexagonal

Birefringence

-9999-9999

0 0.296

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Clarity

Transparent

Opal and Cacoxenite Optic Character

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

Similar to their colors, Opal and Cacoxenite 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, Opal is Transparent, Translucent and Transparent to translucent while Opal is Transparent, Translucent and Transparent to translucent in appearance.