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Rosasite
Rosasite

Thulite
Thulite



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Rosasite
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Thulite

Rosasite and Thulite Optical Properties

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Optical Properties

Luster

Silky, Vitreous
Vitreous

Pleochroism

Strong: X = pale emerald green or colourless; Y = dark emerald green or pale blue; Z = dark emerald green or pale blue
Present

Dispersion

0.030.02
0.005 1
👆🏻

Transparency

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

Refractive Index

1.672-1.6881.695
1 3.25
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Optic Character

-
-

Crystal System

monoclinic
Orthorhombic

Birefringence

0.139-0.1430.006-0.018
0 0.296
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Clarity

-
OpaqueHerve Nicolas Lazzarelli

Rosasite and Thulite Optic Character

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

Rosasite and Thulite Transparency

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