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Garnet
Garnet

Covellite
Covellite



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Garnet
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Covellite

Garnet and Covellite Optical Properties

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Optical Properties

Luster

Vitreous, Adamantine
Resinous

Pleochroism

None
Marked

Dispersion

0.020.08
0.005 1
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Transparency

Transparent, Transparent to translucent
OpaqueAnthony et al

Refractive Index

1.730-1.8951.45-2.62
1 3.25
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Optic Character

-
-

Crystal System

Trigonal
Hexagonal

Birefringence

-9999-9999
0 0.296
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Clarity

Transparent
OpaqueAnthony et al

Garnet and Covellite Optic Character

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

Garnet and Covellite Transparency

Similar to their colors, Garnet 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, Garnet is Transparent and Transparent to translucent while Garnet is Transparent and Transparent to translucent in appearance.