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Andradite and Covellite Optical Properties


Covellite and Andradite Optical Properties


Optical Properties

Luster
Adamantine, Resinous   
Resinous   

Pleochroism
Not Available   
Marked   

Dispersion
0.06   
7
Not Available   

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

Refractive Index
1.88-1.94   
1.45-2.62   

Optic Character
Not Available   
Not Available   

Crystal System
cubic   
Hexagonal   

Birefringence
0.057   
Not Available   

Clarity
Transparent   
OpaqueAnthony et al   

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Andradite and Covellite Optic Character

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

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Andradite and Covellite Transparency

Similar to their colors, Andradite 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, Andradite is Transparent while Andradite is Transparent in appearance.

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