Opal and Scheelite Optical Properties

Opal

Scheelite

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Optical Properties

Luster

Vitreous, Pearly

Vitreous, Adamantine

Pleochroism

None

Definite dichoric in yellow (yellow to orange-brown)

Dispersion

0.010.04

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

Translucent, Transparent

Refractive Index

1.37-1.521.918-1.936

1 3.25

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Optic Character

Crystal System

Trigonal

tetragonal

Birefringence

-99990.016

0 0.296

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Clarity

Transparent

Translucent

Opal and Scheelite Optic Character

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

Similar to their colors, Opal and Scheelite 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.