Chrysoberyl and Thulite Optical Properties

Chrysoberyl

Thulite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

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

Present

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Opaque, Translucent, Opaque . May be translucent in thin backlit sections.

1.5 Refractive Index

1.746-1.7631.695

1 3.25

1.6 Optic Character

Biaxial/+

Not Available

1.7 Crystal System

Orthorhombic

1.8 Birefringence

0.007-0.0130.006-0.018

0 0.296

1.9 Clarity

Transparent

OpaqueHerve Nicolas Lazzarelli

Chrysoberyl and Thulite Optic Character

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

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