Spinel and Thulite Optical Properties

Spinel

Thulite

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Optical Properties

Luster

Vitreous

Pleochroism

Absent

Present

Dispersion

0.020.02

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

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

Refractive Index

1.731.695

1 3.25

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Optic Character

Crystal System

Isometric

Orthorhombic

Birefringence

-99990.006-0.018

0 0.296

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Clarity

TransparentUlrich Henn and Claudio C. Milisenda

OpaqueHerve Nicolas Lazzarelli

Spinel and Thulite Optic Character

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

Similar to their colors, Spinel and Thulite 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, Spinel is Transparent, Translucent and Transparent to translucent while Spinel is Transparent, Translucent and Transparent to translucent in appearance.