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Purpurite and Sillimanite Optical Properties


Sillimanite and Purpurite Optical Properties


Optical Properties

Luster
Not Available   
Vitreous, Subadamantine, Silky   

Pleochroism
StrongArthur Thomas   
Colourless to pale brown to yellow   

Dispersion
Not Available   
Not Available   

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

Refractive Index
1.85-1.92   
1.653-1.685   

Optic Character
Not Available   
Not Available   

Crystal System
Orthorhombic   
Orthorhombic   

Birefringence
0.070   
0.020-0.022   

Clarity
TranslucentWalter Schumann   
Transparent   

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Purpurite and Sillimanite Optic Character

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

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

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