Thulite and Dumortierite Optical Properties

Thulite

Dumortierite

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Optical Properties

Luster

Vitreous

Pleochroism

Present

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

Dispersion

0.020.01

0.005 1

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Transparency

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

Translucent, Translucent to opaque

Refractive Index

1.6951.669-1.723

1 3.25

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Optic Character

Crystal System

Orthorhombic

Birefringence

0.006-0.0180.011-0.037

0 0.296

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Clarity

OpaqueHerve Nicolas Lazzarelli

Translucent

Thulite and Dumortierite Optic Character

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

Similar to their colors, Thulite and Dumortierite 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, Thulite is Opaque, Translucent and Opaque . May be translucent in thin backlit sections. while Thulite is Opaque, Translucent and Opaque . May be translucent in thin backlit sections. in appearance.