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Hibonite and Nepheline Optical Properties


Nepheline and Hibonite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous, Greasy   

Pleochroism
O = brownish gray; E = gray   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
Handbook of mineralogy (2001)   
Transparent, Translucent   

Refractive Index
1.79-1.807   
1.529-1.547   

Optic Character
Not Available   
Not Available   

Crystal System
Hexagonal   
Hexagonal   

Birefringence
Not Available   
0.003-0.004   

Clarity
Handbook of mineralogy (2001)   
Transparent   

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Hibonite and Nepheline Optic Character

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

Similar to their colors, Hibonite and Nepheline 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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