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Cryolite
Cryolite

Lazulite
Lazulite



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Cryolite
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Lazulite

Cryolite and Lazulite Optical Properties

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Optical Properties

Luster

Vitreous, Greasy, Pearly
-

Pleochroism

colorless.
Transparent crystals show a strong pleochroism: colorless light blue dark (violet) blueHerve Nicolas Lazzarelli

Dispersion

0.010.01
0.005 1
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Transparency

-
Transparent, Translucent

Refractive Index

1.338-1.3391.604-1.646
1 3.25
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Optic Character

-
-

Crystal System

monoclinic
monoclinic

Birefringence

0.0010.031-0.036
0 0.296
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Clarity

TransparentUlrich Henn and Claudio C. Milisenda
Transparent

Cryolite and Lazulite Optic Character

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

Similar to their colors, Cryolite and Lazulite 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.