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Omphacite
Omphacite

Thulite
Thulite



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Omphacite
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Thulite

Omphacite and Thulite Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

Weak: colorless -- very pale green -- very pale green
Present

Dispersion

0.020.02
0.005 1
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Transparency

TranslucentAnthony et al
Opaque, Translucent, Opaque . May be translucent in thin backlit sections.

Refractive Index

1.662-1.7231.695
1 3.25
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Optic Character

-
-

Crystal System

-
Orthorhombic

Birefringence

-99990.006-0.018
0 0.296
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Clarity

TranslucentAnthony et al
OpaqueHerve Nicolas Lazzarelli

Omphacite and Thulite Optic Character

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

Omphacite and Thulite Transparency

Similar to their colors, Omphacite 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, Omphacite is TranslucentAnthony et al while Omphacite is TranslucentAnthony et al in appearance.