Thulite and Danburite Optical Properties

Thulite

Danburite

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Optical Properties

Luster

Vitreous

Vitreous, Greasy

Pleochroism

Present

Weak: pale yellow yellow

Dispersion

0.020.02

0.005 1

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Transparency

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

Refractive Index

1.6951.627-1.639

1 3.25

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Optic Character

Biaxial/+

Crystal System

Orthorhombic

Birefringence

0.006-0.0180.006

0 0.296

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Clarity

OpaqueHerve Nicolas Lazzarelli

TransparentUlrich Henn and Claudio C. Milisenda

Thulite and Danburite Optic Character

Thulite and Danburite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Thulite and Danburite 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 Danburite 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. Danburite has Biaxial/+ character.

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Thulite and Danburite Transparency

Similar to their colors, Thulite and Danburite 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.