Emerald and Norbergite Optical Properties

Emerald

Norbergite

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Optical Properties

Luster

Vitreous

Pleochroism

Strong dichroism: yellow green Lazzarelli

Pale yellow very pale yellow colorlessAnthony et al

Dispersion

0.010.02

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

Transparent

Refractive Index

1.565-1.6021.563-1.593

1 3.25

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Optic Character

Crystal System

Hexagonal

Birefringence

0.0040-0.0070-9999

0 0.296

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Clarity

Transparent

Emerald and Norbergite Optic Character

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

Similar to their colors, Emerald and Norbergite 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, Emerald is Transparent, Translucent and Transparent to translucent while Emerald is Transparent, Translucent and Transparent to translucent in appearance.