Covellite and Jet Optical Properties

Covellite

Jet

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1 Optical Properties

1.1 Luster

Resinous

Waxy

1.2 Pleochroism

Marked

AbsentWalter Schumann

1.3 Dispersion

NANone

0.007 1

1.4 Transparency

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

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.45-2.621.640-1.680

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

Amorphous

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

OpaqueAnthony et al

Gemmological Tables (2004) More from other references

Covellite and Jet Optic Character

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

Similar to their colors, Covellite and Jet 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, Covellite is Handbook of mineralogy (2001) More from other references and OpaqueAnthony et al while Covellite is Handbook of mineralogy (2001) More from other references and OpaqueAnthony et al in appearance.