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Hureaulite
Hureaulite

Thulite
Thulite



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Hureaulite
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Thulite

Hureaulite and Thulite Optical Properties

Optical Properties

Luster

Vitreous, Greasy
Vitreous

Pleochroism

Colorless yellow to pale rose reddish yellow to reddish brown.Anthony et al
Present

Dispersion

0.020.02
0.005 1
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Transparency

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

Refractive Index

1.647-1.6671.695
1 3.25
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Optic Character

-
-

Crystal System

Monoclinic Prismatic H-M Symbol (2/m) Space Group: C 2/c
Orthorhombic

Birefringence

0.0120.006-0.018
0 0.296
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Clarity

Transparent
OpaqueHerve Nicolas Lazzarelli

Hureaulite and Thulite Optic Character

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

Hureaulite and Thulite Transparency

Similar to their colors, Hureaulite 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, Hureaulite is Transparent while Hureaulite is Transparent in appearance.