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Common Opal and Grandidierite Optical Properties


Grandidierite and Common Opal Optical Properties


Optical Properties

Luster
Not Available   
Vitreous, Pearly   

Pleochroism
AbsentWalter Schumann   
visible   

Dispersion
None   
Not Available   

Transparency
Translucent   
Gemmological Tables (2004) More from other references   

Refractive Index
1.37-1.52   
1.578-1.639   

Optic Character
Not Available   
Not Available   

Crystal System
Not Available   
Orthorhombic   

Birefringence
Not Available   
0.037-0.039   

Clarity
Translucent   
Gemmological Tables (2004) More from other references   

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Common Opal and Grandidierite Optic Character

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

Similar to their colors, Common Opal and Grandidierite 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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