Nepheline and Omphacite Optical Properties

Nepheline

Omphacite

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1 Optical Properties

1.1 Luster

Vitreous, Greasy

Vitreous

1.2 Pleochroism

Not Available

Weak: colorless -- very pale green -- very pale green

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent, Translucent

TranslucentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.529-1.5471.662-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

Not Available

1.8 Birefringence

0.003-0.004Not Available

0 0.296

1.9 Clarity

Transparent

TranslucentAnthony et al

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.