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Covellite
Covellite

Prasiolite
Prasiolite



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Covellite
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Prasiolite

Covellite and Prasiolite Optical Properties

Optical Properties

Luster

Resinous
Vitreous

Pleochroism

Marked
Very weak: light green pale greenWalter Schumann

Dispersion

0.080.01
0.005 1
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Transparency

OpaqueAnthony et al
Transparent, Translucent

Refractive Index

1.45-2.621.544-1.553
1 3.25
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Optic Character

-
-

Crystal System

Hexagonal
Trigonal

Birefringence

-99990.009
0 0.296
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Clarity

OpaqueAnthony et al
Transparent

Covellite and Prasiolite Optic Character

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

Covellite and Prasiolite Transparency

Similar to their colors, Covellite and Prasiolite 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, Covellite is OpaqueAnthony et al while Covellite is OpaqueAnthony et al in appearance.