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Verdelite
Verdelite

Thulite
Thulite



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Verdelite
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Thulite

Verdelite and Thulite Optical Properties

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Optical Properties

Luster

-
Vitreous

Pleochroism

Strong: dark green yellow
Present

Dispersion

0.020.02
0.005 1
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Transparency

Transparent, Translucent
Opaque, Translucent, Opaque . May be translucent in thin backlit sections.

Refractive Index

1.614-1.6661.695
1 3.25
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Optic Character

-
-

Crystal System

-
Orthorhombic

Birefringence

0.014-0.0400.006-0.018
0 0.296
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Clarity

Transparent
OpaqueHerve Nicolas Lazzarelli

Verdelite and Thulite Optic Character

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

Verdelite and Thulite Transparency

Similar to their colors, Verdelite and Thulite 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, Verdelite is Transparent and Translucent while Verdelite is Transparent and Translucent in appearance.