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Realgar
Realgar

Zoisite
Zoisite



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X
Realgar
X
Zoisite

Realgar and Zoisite Optical Properties

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Optical Properties

Luster

-
Vitreous

Pleochroism

Nearly colorless to pale golden yellowAnthony et al
X = pale pink to red-violet; Y = nearly colorless to bright pink or deep blue; Z = pale yellow to yellow-green

Dispersion

0.060.02
0.005 1
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Transparency

-
Transparent, Translucent, Opaque . May be translucent in thin backlit sections.

Refractive Index

2.538-2.7041.685-1.707
1 3.25
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Optic Character

-
-

Crystal System

-
Orthorhombic

Birefringence

0.1660.006-0.018
0 0.296
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Clarity

-
Transparent

Realgar and Zoisite Optic Character

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

Realgar and Zoisite Transparency

Similar to their colors, Realgar and Zoisite 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, Realgar is while Realgar is in appearance.