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Sillimanite and Lazulite Optical Properties


Lazulite and Sillimanite Optical Properties


Optical Properties

Luster
Vitreous, Subadamantine, Silky   
Not Available   

Pleochroism
Colourless to pale brown to yellow   
Transparent crystals show a strong pleochroism: colorless light blue dark (violet) blueHerve Nicolas Lazzarelli   

Dispersion
Not Available   
0.01   
26

Transparency
Transparent, Translucent   
Transparent, Translucent   

Refractive Index
1.653-1.685   
1.604-1.646   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
monoclinic   

Birefringence
0.020-0.022   
0.031-0.036   

Clarity
Transparent   
Transparent   

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Sillimanite and Lazulite Optic Character

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

Similar to their colors, Sillimanite and Lazulite 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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