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Nepheline
Nepheline

Sphene
Sphene



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Nepheline
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Sphene

Nepheline and Sphene Optical Properties

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1 Optical Properties
1.1 Luster
Vitreous, Greasy
Not Available
1.2 Pleochroism
Not Available
Not Available
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent, Translucent
Not Available
1.5 Refractive Index
1.529-1.5471.84-2.11
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Hexagonal
monoclinic
1.8 Birefringence
0.003-0.004Not Available
Achroite
0 0.296
1.9 Clarity
Transparent
Color grading system

Nepheline and Sphene Optic Character

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

Nepheline and Sphene Transparency

Similar to their colors, Nepheline and Sphene 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.