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Anhydrite
Anhydrite

Hiddenite
Hiddenite



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Anhydrite
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Hiddenite

Anhydrite and Hiddenite Optical Properties

Optical Properties

Luster

Pearly, Greasy
Vitreous

Pleochroism

For violet varieties
Distinct trichroism: yellow green green blue greenHerve Nicolas Lazzarelli

Dispersion

0.010.02
0.005 1
👆🏻

Transparency

Transparent
Transparent

Refractive Index

1.570-1.6141.657-1.681
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Orthorhombic
monoclinic

Birefringence

0.042-0.0440.014-0.016
0 0.296
👆🏻

Clarity

Transparent
TransparentUlrich Henn and Claudio C. Milisenda

Anhydrite and Hiddenite Optic Character

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

Similar to their colors, Anhydrite and Hiddenite 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.