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Dumortierite and Powellite Optical Properties


Powellite and Dumortierite Optical Properties


Optical Properties

Luster
Vitreous   
Greasy, Subadamantine   

Pleochroism
Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue   
In deeply colored specimens: blue greenAnthony et al   

Dispersion
None   
Not Available   

Transparency
Translucent, Translucent to opaque   
Transparent   

Refractive Index
1.669-1.723   
1.974-1.984   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Not Available   

Birefringence
0.011-0.037   
Not Available   

Clarity
Translucent   
Transparent   

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Dumortierite and Powellite Optic Character

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

Similar to their colors, Dumortierite and Powellite 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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