Thulite and Tugtupite Optical Properties

Thulite

Tugtupite

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1 Optical Properties

1.1 Luster

Vitreous

Not Available

1.2 Pleochroism

Present

ModerateArthur Thomas

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

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

OpaqueHerve Nicolas Lazzarelli

1.5 Refractive Index

1.6951.494-1.504

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

tetragonal

1.8 Birefringence

0.006-0.0180.008

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

Thulite and Tugtupite Optic Character

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

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