Fayalite and Covellite Optical Properties

Fayalite

Covellite

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1 Optical Properties

1.1 Luster

Vitreous, Resinous

Resinous

1.2 Pleochroism

Faint

Marked

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

TransparentAnthony et al, Handbook of mineralogy (2001)

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

1.5 Refractive Index

1.827-1.8791.45-2.62

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Hexagonal

1.8 Birefringence

0.042-0.051Not Available

0 0.296

1.9 Clarity

TransparentAnthony et al

OpaqueAnthony et al

Fayalite and Covellite Optic Character

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

Similar to their colors, Fayalite 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, Fayalite is Handbook of mineralogy (2001) and TransparentAnthony et al while Fayalite is Handbook of mineralogy (2001) and TransparentAnthony et al in appearance.