Vesuvianite and Covellite Optical Properties

Vesuvianite

Covellite

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1 Optical Properties

1.1 Luster

Vitreous, Resinous

Resinous

1.2 Pleochroism

slight in colored varieties

Marked

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

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

1.5 Refractive Index

1.703-1.7521.45-2.62

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

tetragonal

Hexagonal

1.8 Birefringence

0.004-0.006Not Available

0 0.296

1.9 Clarity

Not Available

OpaqueAnthony et al

Vesuvianite and Covellite Optic Character

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

Similar to their colors, Vesuvianite 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, Vesuvianite is Not Available while Vesuvianite is Not Available in appearance.