Euclase and Williamsite Optical Properties

Euclase

Williamsite

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Optical Properties

Luster

Vitreous

Waxy, Silky, Resinous, Greasy

Pleochroism

Weak: colorless-(greenish) yellow

Dispersion

0.020.03

0.005 1

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Transparency

TranslucentHerve Nicolas Lazzarelli

Refractive Index

1.650-1.6771.530-1.575

1 3.25

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Optic Character

Crystal System

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

Birefringence

0.019-0.025-9999

0 0.296

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Clarity

TransparentUlrich Henn and Claudio C. Milisenda

TranslucentHerve Nicolas Lazzarelli

Euclase and Williamsite Optic Character

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

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Euclase and Williamsite Transparency

Similar to their colors, Euclase and Williamsite 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.