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Alexandrite and Covellite Optical Properties


Covellite and Alexandrite Optical Properties


Optical Properties

Luster
Vitreous   
Resinous   

Pleochroism
Not Available   
Marked   

Dispersion
Not Available   
Not Available   

Transparency
Transparent, Transparent to nearly opaque   
OpaqueAnthony et al, Handbook of mineralogy (2001) More from other references   

Refractive Index
1.739-1.770   
1.45-2.62   

Optic Character
Biaxial/+   
Not Available   

Crystal System
Orthorhombic   
Hexagonal   

Birefringence
0.007-0.010   
Not Available   

Clarity
Transparent   
OpaqueAnthony et al   

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Alexandrite and Covellite Optic Character

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

Similar to their colors, Alexandrite and Covellite 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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