Thulite and Zincite Optical Properties

Thulite

Zincite

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1 Optical Properties

1.1 Luster

Vitreous

Subadamantine, Resinous

1.2 Pleochroism

Present

Very weak

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

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

TransparentRobert C. Kammerling, The Journal of Gemmology (1995) More from other references

1.5 Refractive Index

1.6952.013-2.029

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Hexagonal

1.8 Birefringence

0.006-0.0180.016

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

TransparentRobert C. Kammerling

Thulite and Zincite Optic Character

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

Similar to their colors, Thulite and Zincite 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.