Beryl and Covellite Optical Properties

Beryl

Covellite

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1 Optical Properties

1.1 Luster

Vitreous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous, Vitreous, Resinous

Resinous

1.2 Pleochroism

Weak to distinct

Marked

1.3 Dispersion

0.01NA

0.007 1

1.4 Transparency

Transparent, Transparent to opaque

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

1.5 Refractive Index

1.560-1.6041.45-2.62

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

Transparent

OpaqueAnthony et al

Beryl and Covellite Optic Character

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

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Beryl and Covellite Transparency

Similar to their colors, Beryl 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, Beryl is Transparent and Transparent to opaque while Beryl is Transparent and Transparent to opaque in appearance.