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Dumortierite and Topaz Optical Properties


Topaz and Dumortierite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

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

Dispersion
None   
0.01   
26

Transparency
Translucent, Translucent to opaque   
Transparent   

Refractive Index
1.669-1.723   
1.606-1.644   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Orthorhombic   

Birefringence
0.011-0.037   
0.008-0.011   

Clarity
Translucent   
TransparentUlrich Henn and Claudio C. Milisenda   

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Dumortierite and Topaz Optic Character

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

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Dumortierite and Topaz Transparency

Similar to their colors, Dumortierite and Topaz 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.

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