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Atacamite
Atacamite

Thulite
Thulite



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Atacamite
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Thulite

Atacamite and Thulite Optical Properties

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Optical Properties

Luster

Adamantine, Vitreous
Vitreous

Pleochroism

X = pale green; Y = yellow-green; Z = grass-green
Present

Dispersion

0.030.02
0.005 1
👆🏻

Transparency

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

Refractive Index

1.8311.695
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Orthorhombic
Orthorhombic

Birefringence

0.0490.006-0.018
0 0.296
👆🏻

Clarity

-
OpaqueHerve Nicolas Lazzarelli

Atacamite and Thulite Optic Character

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

Atacamite and Thulite Transparency

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