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Common Opal and Spinel Optical Properties


Spinel and Common Opal Optical Properties


Optical Properties

Luster
Not Available   
Vitreous   

Pleochroism
AbsentWalter Schumann   
Absent   

Dispersion
None   
0.02   
18

Transparency
Translucent   
Transparent, Translucent, Transparent to translucent   

Refractive Index
1.37-1.52   
1.73   

Optic Character
Not Available   
Not Available   

Crystal System
Not Available   
Isometric   

Birefringence
Not Available   
Not Available   

Clarity
Translucent   
TransparentUlrich Henn and Claudio C. Milisenda   

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Common Opal and Spinel Optic Character

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

Similar to their colors, Common Opal and Spinel 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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