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Alexandrite and Lazulite Optical Properties


Lazulite and Alexandrite Optical Properties


Optical Properties

Luster
Vitreous   
Not Available   

Pleochroism
Not Available   
Transparent crystals show a strong pleochroism: colorless light blue dark (violet) blueHerve Nicolas Lazzarelli   

Dispersion
Not Available   
0.01   
26

Transparency
Transparent, Transparent to nearly opaque   
Transparent, Translucent   

Refractive Index
1.739-1.770   
1.604-1.646   

Optic Character
Biaxial/+   
Not Available   

Crystal System
Orthorhombic   
monoclinic   

Birefringence
0.007-0.010   
0.031-0.036   

Clarity
Transparent   
Transparent   

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Alexandrite and Lazulite Optic Character

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

Similar to their colors, Alexandrite and Lazulite 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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