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Thomsonite and Powellite Optical Properties


Powellite and Thomsonite Optical Properties


Optical Properties

Luster
Vitreous, Pearly   
Greasy, Subadamantine   

Pleochroism
NilArthur Thomas   
In deeply colored specimens: blue greenAnthony et al   

Dispersion
Not Available   
Not Available   

Transparency
Translucent   
Transparent   

Refractive Index
1.510-1.550   
1.974-1.984   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Not Available   

Birefringence
0.015-0.020   
Not Available   

Clarity
Translucent   
Transparent   

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Thomsonite and Powellite Optic Character

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

Similar to their colors, Thomsonite 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, Thomsonite is Translucent while Thomsonite is Translucent in appearance.

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