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Crocoite
Crocoite

Cryolite
Cryolite



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Crocoite
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Cryolite

Crocoite and Cryolite Optical Properties

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Optical Properties

Luster

Adamantine
Vitreous, Greasy, Pearly

Pleochroism

Distinctly trichroic
colorless.

Dispersion

0.020.01
0.005 1
👆🏻

Transparency

Transparent
-

Refractive Index

2.31-2.661.338-1.339
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/n
monoclinic

Birefringence

-99990.001
0 0.296
👆🏻

Clarity

Transparent
TransparentUlrich Henn and Claudio C. Milisenda

Crocoite and Cryolite Optic Character

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

Crocoite and Cryolite Transparency

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