Opal and Zincite Optical Properties

Opal

Zincite

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Optical Properties

Luster

Vitreous, Pearly

Subadamantine, Resinous

Pleochroism

None

Very weak

Dispersion

0.010.16

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

TransparentRobert C. Kammerling

Refractive Index

1.37-1.522.013-2.029

1 3.25

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Optic Character

Crystal System

Trigonal

Hexagonal

Birefringence

-99990.016

0 0.296

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Clarity

Transparent

TransparentRobert C. Kammerling

Opal and Zincite Optic Character

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

Opal Vs Simpsonite

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Opal and Zincite Transparency

Similar to their colors, Opal and Zincite 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.