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Covellite and Iolite Optical Properties


Iolite and Covellite Optical Properties


Optical Properties

Luster
Resinous   
Vitreous   

Pleochroism
Marked   
Not Available   

Dispersion
Not Available   
Not Available   

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

Refractive Index
1.45-2.62   
1.52-1.56   

Optic Character
Not Available   
Not Available   

Crystal System
Hexagonal   
Orthorhombic   

Birefringence
Not Available   
Not Available   

Clarity
OpaqueAnthony et al   
Transparent to translucent   

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Covellite and Iolite Optic Character

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

Similar to their colors, Covellite and Iolite 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, Covellite is Handbook of mineralogy (2001) More from other references and OpaqueAnthony et al while Covellite is Handbook of mineralogy (2001) More from other references and OpaqueAnthony et al in appearance.

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