Crocoite and Covellite Optical Properties

Crocoite

Covellite

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1 Optical Properties

1.1 Luster

Adamantine

Resinous

1.2 Pleochroism

Distinctly trichroic

Marked

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent

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

1.5 Refractive Index

2.31-2.661.45-2.62

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/n

Hexagonal

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Transparent

OpaqueAnthony et al

Crocoite and Covellite Optic Character

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

Similar to their colors, Crocoite 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, Crocoite is Transparent while Crocoite is Transparent in appearance.