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Dumortierite
Dumortierite

Bronzite
Bronzite



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X
Dumortierite
X
Bronzite

Dumortierite and Bronzite Optical Properties

Optical Properties

Luster

Vitreous
-

Pleochroism

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

Dispersion

0.010.02
0.005 1
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Transparency

Translucent, Translucent to opaque
Transparent, Translucent

Refractive Index

1.669-1.7231.668
1 3.25
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Optic Character

-
-

Crystal System

Orthorhombic
Orthorhombic

Birefringence

0.011-0.0370.014
0 0.296
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Clarity

Translucent
Transparent

Dumortierite and Bronzite Optic Character

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

Similar to their colors, Dumortierite and Bronzite 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.