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Euclase
Euclase

Helenite
Helenite



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Euclase
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Helenite

Euclase and Helenite Optical Properties

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Optical Properties

Luster

Vitreous
-

Pleochroism

Weak: colorless-(greenish) yellow
-

Dispersion

0.020.04
0.005 1
👆🏻

Transparency

-
-

Refractive Index

1.650-1.677-9999
1 3.25
👆🏻

Optic Character

-
-

Crystal System

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

0.019-0.025-9999
0 0.296
👆🏻

Clarity

TransparentUlrich Henn and Claudio C. Milisenda
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Euclase and Helenite Optic Character

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

Euclase and Helenite Transparency

Similar to their colors, Euclase and Helenite 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, Euclase is while Euclase is in appearance.