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Common Opal and Covellite Optical Properties


Covellite and Common Opal Optical Properties


Optical Properties

Luster
Not Available   
Resinous   

Pleochroism
AbsentWalter Schumann   
Marked   

Dispersion
None   
Not Available   

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

Refractive Index
1.37-1.52   
1.45-2.62   

Optic Character
Not Available   
Not Available   

Crystal System
Not Available   
Hexagonal   

Birefringence
Not Available   
Not Available   

Clarity
Translucent   
OpaqueAnthony et al   

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<< Physical Properties

Common Opal and Covellite Optic Character

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

Similar to their colors, Common Opal 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, Common Opal is Translucent while Common Opal is Translucent in appearance.

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