Covellite and Titanite Sphene Optical Properties

Covellite

Titanite Sphene

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1 Optical Properties

1.1 Luster

Resinous

Not Available

1.2 Pleochroism

Marked

Green stones strong trichroism: typically colorless greenish yellow brownish to yellow;

1.3 Dispersion

NA0.05

0.007 1

1.4 Transparency

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

Transparent, Translucent

1.5 Refractive Index

1.45-2.621.843-2.110

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

Not Available

1.8 Birefringence

Not Available0.100-0.192

0 0.296

1.9 Clarity

OpaqueAnthony et al

Transparent

Covellite and Titanite Sphene Optic Character

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

Similar to their colors, Covellite and Titanite Sphene 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.