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Analcime and Sillimanite Optical Properties


Sillimanite and Analcime Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous, Subadamantine, Silky   

Pleochroism
colorless.   
Colourless to pale brown to yellow   

Dispersion
Not Available   
Not Available   

Transparency
Transparent, Translucent   
Transparent, Translucent   

Refractive Index
1.479-1.493   
1.653-1.685   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Orthorhombic   

Birefringence
Not Available   
0.020-0.022   

Clarity
Transparent   
Transparent   

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Analcime and Sillimanite Optic Character

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

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

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