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Nacre and Opal Optical Properties


Opal and Nacre Optical Properties


Optical Properties

Luster
Not Available   
Vitreous, Pearly   

Pleochroism
Not Available   
None   

Dispersion
Not Available   
None   

Transparency
Not Available   
Transparent, Translucent, Transparent to translucent   

Refractive Index
Not Available   
1.37-1.52   

Optic Character
Not Available   
Not Available   

Crystal System
Not Available   
Trigonal   

Birefringence
Not Available   
Not Available   

Clarity
Not Available   
Transparent   

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<< Physical Properties

Nacre and Opal Optic Character

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

Similar to their colors, Nacre and Opal 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, Nacre is Not Available while Nacre is Not Available in appearance.

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Black Gemstones


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