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Hercynite and Nepheline Optical Properties


Nepheline and Hercynite Optical Properties


Optical Properties

Luster
Vitreous   
Vitreous, Greasy   

Pleochroism
Not Available   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
Translucent   
Transparent, Translucent   

Refractive Index
1.80-1.83   
1.529-1.547   

Optic Character
Not Available   
Not Available   

Crystal System
Isometric Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m   
Hexagonal   

Birefringence
Not Available   
0.003-0.004   

Clarity
Translucent   
Transparent   

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Hercynite and Nepheline Optic Character

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

Similar to their colors, Hercynite 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, Hercynite is Translucent while Hercynite is Translucent in appearance.

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