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Cat s Eye
Cat s Eye

Opal
Opal



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Cat s Eye
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Opal

Cat s Eye and Opal Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous, Pearly

Pleochroism

-
None

Dispersion

0.020.01
0.005 1
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Transparency

Translucent
Transparent, Translucent, Transparent to translucent

Refractive Index

1.744-1.7551.37-1.52
1 3.25
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Optic Character

-
-

Crystal System

Orthorhombic
Trigonal

Birefringence

-9999-9999
0 0.296
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Clarity

Translucent
Transparent

Cat s Eye and Opal Optic Character

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

Cat s Eye and Opal Transparency

Similar to their colors, Cat s Eye and Opal 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, Cat s Eye is Translucent while Cat s Eye is Translucent in appearance.