Chrysoberyl and Covellite Optical Properties

Chrysoberyl

Covellite

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1 Optical Properties

1.1 Luster

Vitreous

Resinous

1.2 Pleochroism

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

Marked

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

OpaqueAnthony et al, Handbook of mineralogy (2001) More from other references

1.5 Refractive Index

1.746-1.7631.45-2.62

1 3.25

1.6 Optic Character

Biaxial/+

Not Available

1.7 Crystal System

Orthorhombic

Hexagonal

1.8 Birefringence

0.007-0.013Not Available

0 0.296

1.9 Clarity

Transparent

OpaqueAnthony et al

Chrysoberyl and Covellite Optic Character

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

Similar to their colors, Chrysoberyl and Covellite 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.