Covellite and Hollandite Optical Properties

Covellite

Hollandite

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1 Optical Properties

1.1 Luster

Resinous

Not Available

1.2 Pleochroism

Marked

Weak.

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

1.45-2.62Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

monoclinic

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

OpaqueAnthony et al

Not Available

Covellite and Hollandite Optic Character

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

Similar to their colors, Covellite and Hollandite 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.