Sulphur and Covellite Optical Properties

Sulphur

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

TranslucentWalter Schumann, Gemstones of the world (2001)

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

1.5 Refractive Index

1.958-2.2451.45-2.62

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Hexagonal

1.8 Birefringence

0.291Not Available

0 0.296

1.9 Clarity

TranslucentWalter Schumann

OpaqueAnthony et al

Sulphur and Covellite Optic Character

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

Similar to their colors, Sulphur 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, Sulphur is Gemstones of the world (2001) and TranslucentWalter Schumann while Sulphur is Gemstones of the world (2001) and TranslucentWalter Schumann in appearance.