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Celestine and Alexandrite Optical Properties


Alexandrite and Celestine Optical Properties


Optical Properties

Luster
Vitreous, Pearly   
Vitreous   

Pleochroism
Weakly trichroiC   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
Gems   
Transparent, Transparent to nearly opaque   

Refractive Index
1.619-1.635   
1.739-1.770   

Optic Character
Not Available   
Biaxial/+   

Crystal System
Orthorhombic   
Orthorhombic   

Birefringence
0.004-0.012   
0.007-0.010   

Clarity
Gems   
Transparent   

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Celestine and Alexandrite Optic Character

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

Similar to their colors, Celestine and Alexandrite 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, Celestine is Gems while Celestine is Gems in appearance.

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