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Chalcedony and Feldspar Optical Properties


Feldspar and Chalcedony Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
AbsentWalter Schumann   
None   

Dispersion
None   
Not Available   

Transparency
Translucent, Translucent to opaque   
Transparent, Translucent   

Refractive Index
1.530-1.543   
1.518-1.570   

Optic Character
Not Available   
Not Available   

Crystal System
Trigonal   
Triclinic or monoclinic   

Birefringence
0.003-0.009   
0.008-0.010   

Clarity
Translucent   
Transparent   

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Chalcedony and Feldspar Optic Character

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

Similar to their colors, Chalcedony and Feldspar 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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