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Augelite
Augelite

Thulite
Thulite



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Augelite
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Thulite

Augelite and Thulite Optical Properties

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Optical Properties

Luster

Pearly
Vitreous

Pleochroism

-
Present

Dispersion

0.020.02
0.005 1
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Transparency

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

Refractive Index

1.570-1.5911.695
1 3.25
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Optic Character

-
-

Crystal System

-
Orthorhombic

Birefringence

0.020-0.0210.006-0.018
0 0.296
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Clarity

TransparentUlrich Henn and Claudio C. Milisenda
OpaqueHerve Nicolas Lazzarelli

Augelite and Thulite Optic Character

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

Augelite and Thulite Transparency

Similar to their colors, Augelite 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, Augelite is while Augelite is in appearance.