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Benitoite
Benitoite

Realgar
Realgar



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Benitoite
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Realgar

Benitoite and Realgar Optical Properties

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Optical Properties

Luster

Vitreous
-

Pleochroism

O = colorless; E = purple
Nearly colorless to pale golden yellowAnthony et al

Dispersion

0.040.06
0.005 1
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Transparency

Transparent
-

Refractive Index

1.757-1.8042.538-2.704
1 3.25
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Optic Character

-
-

Crystal System

Hexagonal
-

Birefringence

0.0470.166
0 0.296
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Clarity

Transparent
-

Benitoite and Realgar Optic Character

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

Benitoite and Realgar Transparency

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