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Hibonite and Sillimanite Optical Properties


Sillimanite and Hibonite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous, Subadamantine, Silky   

Pleochroism
O = brownish gray; E = gray   
Colourless to pale brown to yellow   

Dispersion
Not Available   
Not Available   

Transparency
Handbook of mineralogy (2001)   
Transparent, Translucent   

Refractive Index
1.79-1.807   
1.653-1.685   

Optic Character
Not Available   
Not Available   

Crystal System
Hexagonal   
Orthorhombic   

Birefringence
Not Available   
0.020-0.022   

Clarity
Handbook of mineralogy (2001)   
Transparent   

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Hibonite and Sillimanite Optic Character

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

Similar to their colors, Hibonite 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, Hibonite is Handbook of mineralogy (2001) while Hibonite is Handbook of mineralogy (2001) in appearance.

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