Emerald and Amblygonite Optical Properties

Emerald

Amblygonite

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1 Optical Properties

1.1 Luster

Vitreous

Vitreous, Pearly

1.2 Pleochroism

Strong dichroism: yellow green Lazzarelli

weak to none

1.3 Dispersion

0.010.01

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.565-1.6021.578-1.646

1 3.25

1.6 Optic Character

Not Available

Biaxial/+

1.7 Crystal System

Hexagonal

Triclinic

1.8 Birefringence

0.0040-0.00700.020-0.030

0 0.296

1.9 Clarity

Color grading system

TransparentUlrich Henn and Claudio C. Milisenda

Emerald and Amblygonite Optic Character

Emerald and Amblygonite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Emerald and Amblygonite 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 Amblygonite 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. Amblygonite has Biaxial/+ character.

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Emerald and Amblygonite Transparency

Similar to their colors, Emerald and Amblygonite 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.