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Phosgenite
Phosgenite

Thulite
Thulite



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Phosgenite
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Thulite

Phosgenite and Thulite Optical Properties

Optical Properties

Luster

Adamantine
Vitreous

Pleochroism

Weakly pleochroic with O reddish and E greenish in thick sections.
Present

Dispersion

0.040.02
0.005 1
👆🏻

Transparency

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

Refractive Index

2.117-2.1451.695
1 3.25
👆🏻

Optic Character

-
-

Crystal System

tetragonal
Orthorhombic

Birefringence

0.0270.006-0.018
0 0.296
👆🏻

Clarity

TransparentUlrich Henn and Claudio C. Milisenda
OpaqueHerve Nicolas Lazzarelli

Phosgenite and Thulite Optic Character

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

Phosgenite and Thulite Transparency

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