Chrysoberyl and Bastnasite Optical Properties

Chrysoberyl

Bastnasite

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Optical Properties

Luster

Vitreous

Vitreous, Greasy, Pearly

Pleochroism

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

Faint

Dispersion

0.020.02

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

Refractive Index

1.746-1.7631.717-1.722

1 3.25

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Optic Character

Biaxial/+

Crystal System

Orthorhombic

Hexagonal

Birefringence

0.007-0.0130.100

0 0.296

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Clarity

Transparent

TransparentUlrich Henn and Claudio C. Milisenda

Chrysoberyl and Bastnasite Optic Character

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

Similar to their colors, Chrysoberyl and Bastnasite 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.