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Andalusite and Cordierite Optical Properties


Cordierite and Andalusite Optical Properties


Optical Properties

Luster
Vitreous, Greasy   
Greasy, Vitreous   

Pleochroism
strongly trichroic   
X = pale yellow   

Dispersion
0.02   
23
Not Available   

Transparency
Transparent, Translucent   
Not Available   

Refractive Index
1.627-1.650   
Not Available   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Orthorhombic   

Birefringence
0.009-0.010   
Not Available   

Clarity
Transparent   
Not Available   

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Andalusite and Cordierite Optic Character

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

Similar to their colors, Andalusite and Cordierite 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.

Brown Gemstones

Brown Gemstones


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