Proustite and Covellite Optical Properties

Proustite

Covellite

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1 Optical Properties

1.1 Luster

Adamantine

Resinous

1.2 Pleochroism

Moderate; cochineal-red to blood-red

Marked

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) Rarely transparentMore from other references

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

1.5 Refractive Index

2.792-3.0871.45-2.62

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Hexagonal

1.8 Birefringence

0.295-0.296Not Available

0 0.296

1.9 Clarity

OpaqueUlrich Henn and Claudio C. Milisenda

OpaqueAnthony et al

Proustite and Covellite Optic Character

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

Similar to their colors, Proustite 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, Proustite is Gemmological Tables (2004) Rarely transparentMore from other references and OpaqueUlrich Henn and Claudio C. Milisenda while Proustite is Gemmological Tables (2004) Rarely transparentMore from other references and OpaqueUlrich Henn and Claudio C. Milisenda in appearance.