Chrysoprase and Covellite Optical Properties

Chrysoprase

Covellite

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Optical Properties

Luster

Vitreous, Waxy

Resinous

Pleochroism

Marked

Dispersion

0.010.08

0.005 1

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Transparency

Translucent, Opaque, Translucent to nearly opaque

OpaqueAnthony et al

Refractive Index

1.530-1.5431.45-2.62

1 3.25

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Optic Character

Crystal System

Trigonal

Hexagonal

Birefringence

0.004-9999

0 0.296

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Clarity

Translucent

OpaqueAnthony et al

Chrysoprase and Covellite Optic Character

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

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Chrysoprase and Covellite Transparency

Similar to their colors, Chrysoprase 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, Chrysoprase is Translucent, Opaque and Translucent to nearly opaque while Chrysoprase is Translucent, Opaque and Translucent to nearly opaque in appearance.