Chrysoberyl and Mottramite Optical Properties

Chrysoberyl

Mottramite

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Optical Properties

Luster

Vitreous

Greasy

Pleochroism

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

Visible X=Y= canary yellow to greenish yellow

Dispersion

0.020.04

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

Refractive Index

1.746-1.7632.170

1 3.25

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Optic Character

Biaxial/+

Crystal System

Orthorhombic

Birefringence

0.007-0.0130.150

0 0.296

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Clarity

Transparent

Chrysoberyl and Mottramite Optic Character

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

Similar to their colors, Chrysoberyl and Mottramite 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.