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Sillimanite and Smoky Quartz Optical Properties


Smoky Quartz and Sillimanite Optical Properties


Optical Properties

Luster
Vitreous, Subadamantine, Silky   
Vitreous   

Pleochroism
Colourless to pale brown to yellow   
None   

Dispersion
Not Available   
0.01   
27

Transparency
Transparent, Translucent   
Transparent, Translucent, Transparent to translucent   

Refractive Index
1.653-1.685   
1.544-1.553   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Hexagonal   

Birefringence
0.020-0.022   
0.009   

Clarity
Transparent   
Opaque   

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Sillimanite and Smoky Quartz Optic Character

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

Similar to their colors, Sillimanite and Smoky Quartz 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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