Emerald and Covellite Optical Properties

Emerald

Covellite

Add ⊕

1 Optical Properties

1.1 Luster

Vitreous

Resinous

1.2 Pleochroism

Strong dichroism: yellow green Lazzarelli

Marked

1.3 Dispersion

0.01NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

OpaqueAnthony et al, Handbook of mineralogy (2001) More from other references

1.5 Refractive Index

1.565-1.6021.45-2.62

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

1.8 Birefringence

0.0040-0.0070Not Available

0 0.296

1.9 Clarity

Color grading system

OpaqueAnthony et al

Emerald and Covellite Optic Character

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

Compare Birthstones » More

Emerald Vs Coral

Emerald Vs Diamond

Emerald Vs Sapphire

» More

More Compare Birthstones

Emerald and Covellite Transparency

Similar to their colors, Emerald and Covellite 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.