Chrysoprase and Sillimanite Optical Properties

Chrysoprase

Sillimanite

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Optical Properties

Luster

Vitreous, Waxy

Vitreous, Subadamantine, Silky

Pleochroism

Colourless to pale brown to yellow

Dispersion

0.010.02

0.005 1

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Transparency

Translucent, Opaque, Translucent to nearly opaque

Transparent, Translucent

Refractive Index

1.530-1.5431.653-1.685

1 3.25

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Optic Character

Crystal System

Trigonal

Orthorhombic

Birefringence

0.0040.020-0.022

0 0.296

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Clarity

Translucent

Transparent

Chrysoprase and Sillimanite Optic Character

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

Similar to their colors, Chrysoprase and Sillimanite 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.