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Euclase
Euclase

Topaz
Topaz



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Euclase
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Topaz

Euclase and Topaz Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous

Pleochroism

Weak: colorless-(greenish) yellow
Weak

Dispersion

0.020.01
0.005 1
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Transparency

-
Transparent

Refractive Index

1.650-1.6771.606-1.644
1 3.25
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Optic Character

-
-

Crystal System

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

Birefringence

0.019-0.0250.008-0.011
0 0.296
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Clarity

TransparentUlrich Henn and Claudio C. Milisenda
TransparentUlrich Henn and Claudio C. Milisenda

Euclase and Topaz Optic Character

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

Similar to their colors, Euclase and Topaz 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.