Covellite and Bertrandite Optical Properties

Covellite

Bertrandite

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1 Optical Properties

1.1 Luster

Resinous

Vitreous

1.2 Pleochroism

Marked

none.

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

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

TransparentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.45-2.621.583-1.614

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

OpaqueAnthony et al

TransparentAnthony et al

Covellite and Bertrandite Optic Character

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

Similar to their colors, Covellite and Bertrandite 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.