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Andalusite and Black Opal Optical Properties


Black Opal and Andalusite Optical Properties


Optical Properties

Luster
Vitreous, Greasy   
Not Available   

Pleochroism
strongly trichroic   
AbsentWalter Schumann   

Dispersion
0.02   
23
None   

Transparency
Transparent, Translucent   
Transparent, Translucent   

Refractive Index
1.627-1.650   
1.370-1.470   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Not Available   

Birefringence
0.009-0.010   
Not Available   

Clarity
Transparent   
Transparent   

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Andalusite and Black Opal Optic Character

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

Similar to their colors, Andalusite and Black 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, Andalusite is Translucent and Transparent while Andalusite is Translucent and Transparent in appearance.

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