Chrysoprase and Dravite Optical Properties

Chrysoprase

Dravite

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Optical Properties

Luster

Vitreous, Waxy

Vitreous

Pleochroism

Very strong: pale yellow colorless

Dispersion

0.010.02

0.005 1

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Transparency

Translucent, Opaque, Translucent to nearly opaque

Transparent

Refractive Index

1.530-1.5431.614-1.666

1 3.25

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Optic Character

Crystal System

Trigonal

Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m

Birefringence

0.0040.014-0.032

0 0.296

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Clarity

Translucent

Transparent

Chrysoprase and Dravite Optic Character

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

Similar to their colors, Chrysoprase and Dravite 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.