Chrysoberyl and Allanite Optical Properties

Chrysoberyl

Allanite

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Optical Properties

Luster

Vitreous

Pleochroism

X = red; Y = yellow-orange; Z = emerald-green

Dispersion

0.020.02

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

Refractive Index

1.746-1.7631

1 3.25

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Optic Character

Biaxial/+

Crystal System

Orthorhombic

Birefringence

0.007-0.0130.013-0.036

0 0.296

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Clarity

Transparent

Chrysoberyl and Allanite Optic Character

Chrysoberyl and Allanite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Chrysoberyl and Allanite 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 Chrysoberyl and Allanite 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. Chrysoberyl has Biaxial/+ character.

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Chrysoberyl and Allanite Transparency

Similar to their colors, Chrysoberyl and Allanite 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, Chrysoberyl is Transparent, Translucent and Transparent to translucent while Chrysoberyl is Transparent, Translucent and Transparent to translucent in appearance.