Covellite and Polyhalite Optical Properties

Covellite

Polyhalite

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1 Optical Properties

1.1 Luster

Resinous

Vitreous, Resinous

1.2 Pleochroism

Marked

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

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

Not Available

1.5 Refractive Index

1.45-2.621.546-1.548

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

Triclinic

1.8 Birefringence

Not Available0.021

0 0.296

1.9 Clarity

OpaqueAnthony et al

Not Available

Covellite and Polyhalite Optic Character

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

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Covellite Vs Fluorapatite

Covellite and Polyhalite Transparency

Similar to their colors, Covellite and Polyhalite 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.