Williamsite and Thulite Optical Properties

Williamsite

Thulite

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Optical Properties

Luster

Waxy, Silky, Resinous, Greasy

Vitreous

Pleochroism

Present

Dispersion

0.030.02

0.005 1

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Transparency

TranslucentHerve Nicolas Lazzarelli

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

Refractive Index

1.530-1.5751.695

1 3.25

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Optic Character

Crystal System

Orthorhombic

Birefringence

-99990.006-0.018

0 0.296

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Clarity

TranslucentHerve Nicolas Lazzarelli

OpaqueHerve Nicolas Lazzarelli

Williamsite and Thulite Optic Character

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

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Williamsite Vs Analcime

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Williamsite and Thulite Transparency

Similar to their colors, Williamsite 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, Williamsite is TranslucentHerve Nicolas Lazzarelli while Williamsite is TranslucentHerve Nicolas Lazzarelli in appearance.