Chrysoberyl and Spinel Optical Properties

Chrysoberyl

Spinel

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

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

Absent

1.3 Dispersion

0.020.02

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

1.5 Refractive Index

1.746-1.7631.73

1 3.25

1.6 Optic Character

Biaxial/+

Not Available

1.7 Crystal System

Orthorhombic

Isometric

1.8 Birefringence

0.007-0.013Not Available

0 0.296

1.9 Clarity

Transparent

TransparentUlrich Henn and Claudio C. Milisenda

Chrysoberyl and Spinel Optic Character

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

Similar to their colors, Chrysoberyl and Spinel 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.