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Sillimanite and Wavellite Optical Properties


Wavellite and Sillimanite Optical Properties


Optical Properties

Luster
Vitreous, Subadamantine, Silky   
Vitreous, Resinous, Pearly   

Pleochroism
Colourless to pale brown to yellow   
Weak   

Dispersion
Not Available   
Not Available   

Transparency
Transparent, Translucent   
Gems   

Refractive Index
1.653-1.685   
1.518-1.561   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Orthorhombic   

Birefringence
0.020-0.022   
0.025   

Clarity
Transparent   
Gems   

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Sillimanite and Wavellite Optic Character

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

Similar to their colors, Sillimanite and Wavellite 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, Sillimanite is Translucent and Transparent while Sillimanite is Translucent and Transparent in appearance.

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