Andesine and Covellite Optical Properties

Andesine

Covellite

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1 Optical Properties

1.1 Luster

Vitreous

Resinous

1.2 Pleochroism

colorless.

Marked

1.3 Dispersion

0.70NA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

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

1.5 Refractive Index

1.543-1.5641.45-2.62

1 3.25

1.6 Optic Character

Biaxial/+

Not Available

1.7 Crystal System

Triclinic

Hexagonal

1.8 Birefringence

0.007-0.011Not Available

0 0.296

1.9 Clarity

Transparent

OpaqueAnthony et al

Andesine and Covellite Optic Character

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

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Andesine and Covellite Transparency

Similar to their colors, Andesine 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, Andesine is Translucent, Transparent and Transparent to translucent while Andesine is Translucent, Transparent and Transparent to translucent in appearance.