Emerald and Vivianite Optical Properties

Emerald

Vivianite

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Optical Properties

Luster

Vitreous

Vitreous, Pearly

Pleochroism

Strong dichroism: yellow green Lazzarelli

Anomalous plechroism is strong with colours deep blue/pale yellowish green/yellowish green.Michael OâDonoghue

Dispersion

0.010.03

0.005 1

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Transparency

Transparent, Translucent, Transparent to translucent

Transparent

Refractive Index

1.565-1.6021.560-1.640

1 3.25

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Optic Character

Crystal System

Hexagonal

Birefringence

0.0040-0.00700.054-0.075

0 0.296

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Clarity

Transparent

Emerald and Vivianite Optic Character

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

Similar to their colors, Emerald and Vivianite 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.