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Nepheline and Siderite Optical Properties


Siderite and Nepheline Optical Properties


Optical Properties

Luster
Vitreous, Greasy   
Pearly   

Pleochroism
Not Available   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
Transparent, Translucent   
Transparent, Translucent   

Refractive Index
1.529-1.547   
1.633-1.875   

Optic Character
Not Available   
Not Available   

Crystal System
Hexagonal   
Trigonal   

Birefringence
0.003-0.004   
0.242   

Clarity
Transparent   
Transparent   

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<< Physical Properties

Nepheline and Siderite Optic Character

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

Similar to their colors, Nepheline and Siderite 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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Red Gemstones


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