Titanite Sphene and Covellite Optical Properties

Titanite Sphene

Covellite

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1 Optical Properties

1.1 Luster

Not Available

Resinous

1.2 Pleochroism

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

Marked

1.3 Dispersion

0.05NA

0.007 1

1.4 Transparency

Transparent, Translucent

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

1.5 Refractive Index

1.843-2.1101.45-2.62

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Hexagonal

1.8 Birefringence

0.100-0.192Not Available

0 0.296

1.9 Clarity

Transparent

OpaqueAnthony et al

Titanite Sphene and Covellite Optic Character

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

Similar to their colors, Titanite Sphene 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, Titanite Sphene is Translucent and Transparent while Titanite Sphene is Translucent and Transparent in appearance.