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Amethyst
Amethyst

Crocoite
Crocoite



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Amethyst
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Crocoite

Amethyst and Crocoite Optical Properties

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Optical Properties

Luster

Vitreous
Adamantine

Pleochroism

None
Distinctly trichroic

Dispersion

0.010.02
0.005 1
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Transparency

Transparent, Transparent to translucent
Transparent

Refractive Index

1.544-1.5532.31-2.66
1 3.25
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Optic Character

-
-

Crystal System

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

Birefringence

0.009-9999
0 0.296
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Clarity

Transparent
Transparent

Amethyst and Crocoite Optic Character

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

Amethyst and Crocoite Transparency

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