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Alexandrite and Friedelite Optical Properties


Friedelite and Alexandrite Optical Properties


Optical Properties

Luster
Vitreous   
Not Available   

Pleochroism
Not Available   
NilArthur Thomas   

Dispersion
Not Available   
Not Available   

Transparency
Transparent, Transparent to nearly opaque   
Translucent   

Refractive Index
1.739-1.770   
1.627-1.663   

Optic Character
Biaxial/+   
Not Available   

Crystal System
Orthorhombic   
Monoclinic Prismatic H-M Symbol (2/m) Space Group: C 2/m   

Birefringence
0.007-0.010   
0.032-0.035   

Clarity
Transparent   
Translucent   

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Alexandrite and Friedelite Optic Character

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

Similar to their colors, Alexandrite and Friedelite 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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