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Dravite
Dravite

Eudialyte
Eudialyte



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Dravite
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Eudialyte

Dravite and Eudialyte Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

Very strong: pale yellow colorless
Weak: O= colorless

Dispersion

0.020.01
0.005 1
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Transparency

Transparent
Translucent

Refractive Index

1.614-1.6661.591-1.633
1 3.25
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Optic Character

-
-

Crystal System

Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Trigonal

Birefringence

0.014-0.0320.003-0.010
0 0.296
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Clarity

Transparent
Translucent

Dravite and Eudialyte Optic Character

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

Dravite and Eudialyte Transparency

Similar to their colors, Dravite and Eudialyte 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, Dravite is Transparent while Dravite is Transparent in appearance.