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Dumortierite
Dumortierite

Cuprite
Cuprite



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Dumortierite
X
Cuprite

Dumortierite and Cuprite Optical Properties

Optical Properties

Luster

Vitreous
Adamantine

Pleochroism

Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue
visible

Dispersion

0.010.05
0.005 1
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Transparency

Translucent, Translucent to opaque
TranslucentWalter Schumann

Refractive Index

1.669-1.7232.849
1 3.25
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Optic Character

-
-

Crystal System

Orthorhombic
cubic

Birefringence

0.011-0.037-9999
0 0.296
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Clarity

Translucent
TranslucentWalter Schumann

Dumortierite and Cuprite Optic Character

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

Dumortierite and Cuprite Transparency

Similar to their colors, Dumortierite and Cuprite 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, Dumortierite is Translucent and Translucent to opaque while Dumortierite is Translucent and Translucent to opaque in appearance.