Ruby and Cordierite Optical Properties

Ruby

Cordierite

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Optical Properties

Luster

Vitreous, Adamantine

Greasy, Vitreous

Pleochroism

Strong: purplish-red

X = pale yellow

Dispersion

0.020.01

0.005 1

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Transparency

Transparent, Translucent, Transparent to opaque

Refractive Index

1.762-1.778-9999

1 3.25

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Optic Character

Crystal System

Trigonal

Orthorhombic

Birefringence

0.008-9999

0 0.296

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Clarity

Transparent

Ruby and Cordierite Optic Character

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

Similar to their colors, Ruby and Cordierite 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, Ruby is Transparent, Translucent and Transparent to opaque while Ruby is Transparent, Translucent and Transparent to opaque in appearance.