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Chalcedony and Powellite Optical Properties


Powellite and Chalcedony Optical Properties


Optical Properties

Luster
Vitreous   
Greasy, Subadamantine   

Pleochroism
AbsentWalter Schumann   
In deeply colored specimens: blue greenAnthony et al   

Dispersion
None   
Not Available   

Transparency
Translucent, Translucent to opaque   
Transparent   

Refractive Index
1.530-1.543   
1.974-1.984   

Optic Character
Not Available   
Not Available   

Crystal System
Trigonal   
Not Available   

Birefringence
0.003-0.009   
Not Available   

Clarity
Translucent   
Transparent   

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Chalcedony and Powellite Optic Character

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

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

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