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Rock Crystal and Sillimanite Optical Properties


Sillimanite and Rock Crystal Optical Properties


Optical Properties

Luster
Not Available   
Vitreous, Subadamantine, Silky   

Pleochroism
AbsentWalter Schumann   
Colourless to pale brown to yellow   

Dispersion
0.01   
27
Not Available   

Transparency
TransparentWalter Schumann, Gemstones of the world (2001) More from other references   
Transparent, Translucent   

Refractive Index
1.544-1.553   
1.653-1.685   

Optic Character
Not Available   
Not Available   

Crystal System
Not Available   
Orthorhombic   

Birefringence
0.009   
0.020-0.022   

Clarity
TransparentWalter Schumann   
Transparent   

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Rock Crystal and Sillimanite Optic Character

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

Similar to their colors, Rock Crystal 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, Rock Crystal is Gemstones of the world (2001) More from other references and TransparentWalter Schumann while Rock Crystal is Gemstones of the world (2001) More from other references and TransparentWalter Schumann in appearance.

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