Covellite and Hiddenite Optical Properties

Covellite

Hiddenite

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1 Optical Properties

1.1 Luster

Resinous

Vitreous

1.2 Pleochroism

Marked

Distinct trichroism: yellow green green blue greenHerve Nicolas Lazzarelli

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

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

Transparent

1.5 Refractive Index

1.45-2.621.657-1.681

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

monoclinic

1.8 Birefringence

Not Available0.014-0.016

0 0.296

1.9 Clarity

OpaqueAnthony et al

TransparentUlrich Henn and Claudio C. Milisenda

Covellite and Hiddenite Optic Character

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

Similar to their colors, Covellite and Hiddenite 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.