Covellite and Danburite Optical Properties

Covellite

Danburite

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1 Optical Properties

1.1 Luster

Resinous

Vitreous, Greasy

1.2 Pleochroism

Marked

Weak: pale yellow yellow

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

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

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.45-2.621.627-1.639

1 3.25

1.6 Optic Character

Not Available

Biaxial/+

1.7 Crystal System

Hexagonal

Orthorhombic

1.8 Birefringence

Not Available0.006

0 0.296

1.9 Clarity

OpaqueAnthony et al

TransparentUlrich Henn and Claudio C. Milisenda

Covellite and Danburite Optic Character

Covellite and Danburite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Covellite and Danburite 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 Danburite 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. Danburite has Biaxial/+ character.

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Covellite and Danburite Transparency

Similar to their colors, Covellite and Danburite 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.