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Nepheline and Omphacite Optical Properties


Omphacite and Nepheline Optical Properties


Optical Properties

Luster
Vitreous, Greasy   
Vitreous   

Pleochroism
Not Available   
Weak: colorless -- very pale green -- very pale green   

Dispersion
Not Available   
Not Available   

Transparency
Transparent, Translucent   
TranslucentAnthony et al, Handbook of mineralogy (2001)   

Refractive Index
1.529-1.547   
1.662-1.723   

Optic Character
Not Available   
Not Available   

Crystal System
Hexagonal   
Not Available   

Birefringence
0.003-0.004   
Not Available   

Clarity
Transparent   
TranslucentAnthony et al   

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Nepheline and Omphacite Optic Character

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

Similar to their colors, Nepheline and Omphacite 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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