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Quartz and Sillimanite Optical Properties


Sillimanite and Quartz Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous, Subadamantine, Silky   

Pleochroism
None   
Colourless to pale brown to yellow   

Dispersion
0.01   
27
Not Available   

Transparency
Transparent, Translucent, Transparent to translucent   
Transparent, Translucent   

Refractive Index
1.544-1.553   
1.653-1.685   

Optic Character
Not Available   
Not Available   

Crystal System
Trigonal   
Orthorhombic   

Birefringence
0.009   
0.020-0.022   

Clarity
Opaque   
Transparent   

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Quartz and Sillimanite Optic Character

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

Similar to their colors, Quartz 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, Quartz is Translucent, Transparent and Transparent to translucent while Quartz is Translucent, Transparent and Transparent to translucent in appearance.

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