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Prasiolite
Prasiolite

Colemanite
Colemanite



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Prasiolite
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Colemanite

Prasiolite and Colemanite Optical Properties

Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

Very weak: light green pale greenWalter Schumann
-

Dispersion

0.010.02
0.005 1
👆🏻

Transparency

Transparent, Translucent
Transparent

Refractive Index

1.544-1.5531.584-1.615
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Trigonal
Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/a

Birefringence

0.0090.028-0.030
0 0.296
👆🏻

Clarity

Transparent
Transparent

Prasiolite and Colemanite Optic Character

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

Prasiolite and Colemanite Transparency

Similar to their colors, Prasiolite and Colemanite 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, Prasiolite is Transparent and Translucent while Prasiolite is Transparent and Translucent in appearance.