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Eudialyte
Eudialyte

Thulite
Thulite



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Eudialyte
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Thulite

Eudialyte and Thulite Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

Weak: O= colorless
Present

Dispersion

0.010.02
0.005 1
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Transparency

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

Refractive Index

1.591-1.6331.695
1 3.25
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Optic Character

-
-

Crystal System

Trigonal
Orthorhombic

Birefringence

0.003-0.0100.006-0.018
0 0.296
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Clarity

Translucent
OpaqueHerve Nicolas Lazzarelli

Eudialyte and Thulite Optic Character

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

Eudialyte and Thulite Transparency

Similar to their colors, Eudialyte 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, Eudialyte is Translucent while Eudialyte is Translucent in appearance.