Dumortierite and Williamsite Optical Properties

Dumortierite

Williamsite

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Optical Properties

Luster

Vitreous

Waxy, Silky, Resinous, Greasy

Pleochroism

Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue

Dispersion

0.010.03

0.005 1

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Transparency

Translucent, Translucent to opaque

TranslucentHerve Nicolas Lazzarelli

Refractive Index

1.669-1.7231.530-1.575

1 3.25

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Optic Character

Crystal System

Orthorhombic

Birefringence

0.011-0.037-9999

0 0.296

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Clarity

Translucent

TranslucentHerve Nicolas Lazzarelli

Dumortierite and Williamsite Optic Character

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

Similar to their colors, Dumortierite 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, Dumortierite is Translucent and Translucent to opaque while Dumortierite is Translucent and Translucent to opaque in appearance.