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Cryolite
Cryolite

Rosasite
Rosasite



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Cryolite
X
Rosasite

Cryolite and Rosasite Optical Properties

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Optical Properties

Luster

Vitreous, Greasy, Pearly
Silky, Vitreous

Pleochroism

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

Dispersion

0.010.03
0.005 1
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Transparency

-
-

Refractive Index

1.338-1.3391.672-1.688
1 3.25
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Optic Character

-
-

Crystal System

monoclinic
monoclinic

Birefringence

0.0010.139-0.143
0 0.296
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Clarity

TransparentUlrich Henn and Claudio C. Milisenda
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Cryolite and Rosasite Optic Character

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

Cryolite and Rosasite Transparency

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