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Scheelite
Scheelite

Thulite
Thulite



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Scheelite
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Thulite

Scheelite and Thulite Optical Properties

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Optical Properties

Luster

Vitreous, Adamantine
Vitreous

Pleochroism

Definite dichoric in yellow (yellow to orange-brown)
Present

Dispersion

0.040.02
0.005 1
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Transparency

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

Refractive Index

1.918-1.9361.695
1 3.25
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Optic Character

-
-

Crystal System

tetragonal
Orthorhombic

Birefringence

0.0160.006-0.018
0 0.296
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Clarity

Translucent
OpaqueHerve Nicolas Lazzarelli

Scheelite and Thulite Optic Character

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

Scheelite and Thulite Transparency

Similar to their colors, Scheelite 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, Scheelite is Translucent and Transparent while Scheelite is Translucent and Transparent in appearance.