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Chalcedony and Benitoite Optical Properties


Benitoite and Chalcedony Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous   

Pleochroism
AbsentWalter Schumann   
O = colorless; E = purple   

Dispersion
None   
0.04   
11

Transparency
Translucent, Translucent to opaque   
Transparent   

Refractive Index
1.530-1.543   
1.757-1.804   

Optic Character
Not Available   
Not Available   

Crystal System
Trigonal   
Hexagonal   

Birefringence
0.003-0.009   
0.047   

Clarity
Translucent   
Transparent   

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Chalcedony and Benitoite Optic Character

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

Similar to their colors, Chalcedony and Benitoite 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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