Thulite and Grandidierite Optical Properties

Thulite

Grandidierite

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1 Optical Properties

1.1 Luster

Vitreous

Vitreous, Pearly

1.2 Pleochroism

Present

visible

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

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

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.6951.578-1.639

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

1.8 Birefringence

0.006-0.0180.037-0.039

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

Gemmological Tables (2004) More from other references

Thulite and Grandidierite Optic Character

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

Similar to their colors, Thulite and Grandidierite 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.