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Alexandrite and Cordierite Optical Properties


Cordierite and Alexandrite Optical Properties


Optical Properties

Luster
Vitreous   
Greasy, Vitreous   

Pleochroism
Not Available   
X = pale yellow   

Dispersion
Not Available   
Not Available   

Transparency
Transparent, Transparent to nearly opaque   
Not Available   

Refractive Index
1.739-1.770   
Not Available   

Optic Character
Biaxial/+   
Not Available   

Crystal System
Orthorhombic   
Orthorhombic   

Birefringence
0.007-0.010   
Not Available   

Clarity
Transparent   
Not Available   

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<< Physical Properties

Alexandrite and Cordierite Optic Character

Alexandrite and Cordierite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Alexandrite and Cordierite 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 Alexandrite and Cordierite 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. Alexandrite has Biaxial/+ character.

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Alexandrite and Cordierite Transparency

Similar to their colors, Alexandrite and Cordierite 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, Alexandrite is Transparent and Transparent to nearly opaque while Alexandrite is Transparent and Transparent to nearly opaque in appearance.

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