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Nickeline and Alexandrite Optical Properties


Alexandrite and Nickeline Optical Properties


Optical Properties

Luster
Not Available   
Vitreous   

Pleochroism
Strong (reflected light)   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
Not Available   
Transparent, Transparent to nearly opaque   

Refractive Index
Not Available   
1.739-1.770   

Optic Character
Not Available   
Biaxial/+   

Crystal System
Hexagonal   
Orthorhombic   

Birefringence
Not Available   
0.007-0.010   

Clarity
Not Available   
Transparent   

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Nickeline and Alexandrite Optic Character

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

Similar to their colors, Nickeline 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, Nickeline is Not Available while Nickeline is Not Available in appearance.

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Red Gemstones


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