Covellite and Rosasite Optical Properties

Covellite

Rosasite

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1 Optical Properties

1.1 Luster

Resinous

Silky, Vitreous

1.2 Pleochroism

Marked

Strong: X = pale emerald green or colourless; Y = dark emerald green or pale blue; Z = dark emerald green or pale blue

1.3 Dispersion

NANA

0.007 1

1.7 Transparency

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

Not Available

1.8 Refractive Index

1.45-2.621.672-1.688

1 3.25

1.9 Optic Character

Not Available

1.10 Crystal System

Hexagonal

monoclinic

1.11 Birefringence

Not Available0.139-0.143

0 0.296

1.12 Clarity

OpaqueAnthony et al

Not Available

Covellite and Rosasite Optic Character

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

Compare Blue Gemstones

Covellite Vs Elbaite

Covellite Vs Fluorapatite

Covellite Vs Falcons Eye

Covellite and Rosasite Transparency

Similar to their colors, Covellite and Rosasite 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.