Emerald and Foitite Optical Properties

Emerald

Foitite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Strong dichroism: yellow green Lazzarelli

Strong: pale lavender dark blueAnthony et al

1.3 Dispersion

0.01NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

TranslucentAnthony et al, Translucent

1.5 Refractive Index

1.565-1.602Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m

1.8 Birefringence

0.0040-0.0070Not Available

0 0.296

1.9 Clarity

Color grading system

TranslucentAnthony et al

Emerald and Foitite Optic Character

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

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