Thulite and Demantoid Optical Properties

Thulite

Demantoid

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Optical Properties

Luster

Vitreous

Adamantine

Pleochroism

Present

None

Dispersion

0.020.06

0.005 1

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Transparency

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

Refractive Index

1.6951.880-1.890

1 3.25

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Optic Character

Crystal System

Orthorhombic

cubic

Birefringence

0.006-0.018-9999

0 0.296

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Clarity

OpaqueHerve Nicolas Lazzarelli

TransparentUlrich Henn and Claudio C. Milisenda

Thulite and Demantoid Optic Character

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

Similar to their colors, Thulite and Demantoid 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.