Quartz and Covellite Optical Properties

Quartz

Covellite

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Optical Properties

Luster

Vitreous

Resinous

Pleochroism

None

Marked

Dispersion

0.010.08

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

OpaqueAnthony et al

Refractive Index

1.544-1.5531.45-2.62

1 3.25

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Optic Character

Crystal System

Trigonal

Hexagonal

Birefringence

0.009-9999

0 0.296

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Clarity

Opaque

OpaqueAnthony et al

Quartz and Covellite Optic Character

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

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