Apache Tear and Covellite Optical Properties

Apache Tear

Covellite

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1 Optical Properties

1.1 Luster

Not Available

Resinous

1.2 Pleochroism

Not Available

Marked

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

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

1.5 Refractive Index

Not Available1.45-2.62

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Amorphous

Hexagonal

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Not Available

OpaqueAnthony et al

Apache Tear and Covellite Optic Character

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

Similar to their colors, Apache Tear 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, Apache Tear is Not Available while Apache Tear is Not Available in appearance.