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Anhydrite
Anhydrite

Cryolite
Cryolite



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Anhydrite
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Cryolite

Anhydrite and Cryolite Optical Properties

Optical Properties

Luster

Pearly, Greasy
Vitreous, Greasy, Pearly

Pleochroism

For violet varieties
colorless.

Dispersion

0.010.01
0.005 1
👆🏻

Transparency

Transparent
-

Refractive Index

1.570-1.6141.338-1.339
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Orthorhombic
monoclinic

Birefringence

0.042-0.0440.001
0 0.296
👆🏻

Clarity

Transparent
TransparentUlrich Henn and Claudio C. Milisenda

Anhydrite and Cryolite Optic Character

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

Anhydrite and Cryolite Transparency

Similar to their colors, Anhydrite 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, Anhydrite is Transparent while Anhydrite is Transparent in appearance.