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Nepheline and Spinel Optical Properties


Spinel and Nepheline Optical Properties


Optical Properties

Luster
Vitreous, Greasy   
Vitreous   

Pleochroism
Not Available   
Absent   

Dispersion
Not Available   
0.02   
18

Transparency
Transparent, Translucent   
Transparent, Translucent, Transparent to translucent   

Refractive Index
1.529-1.547   
1.73   

Optic Character
Not Available   
Not Available   

Crystal System
Hexagonal   
Isometric   

Birefringence
0.003-0.004   
Not Available   

Clarity
Transparent   
TransparentUlrich Henn and Claudio C. Milisenda   

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Nepheline and Spinel Optic Character

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

Similar to their colors, Nepheline and Spinel 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, Nepheline is Translucent and Transparent while Nepheline is Translucent and Transparent in appearance.

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