Covellite and Tourmaline Optical Properties

Covellite

Tourmaline

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1 Optical Properties

1.1 Luster

Resinous

Vitreous

1.2 Pleochroism

Marked

typically moderate to strong

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

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

Transparent, Translucent, Transparent to opaque

1.5 Refractive Index

1.45-2.621.614-1.666

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

Trigonal

1.8 Birefringence

Not Available0.014-0.040

0 0.296

1.9 Clarity

OpaqueAnthony et al

Transparent

Covellite and Tourmaline Optic Character

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

Similar to their colors, Covellite and Tourmaline 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.