Fayalite and Thulite Optical Properties

Fayalite

Thulite

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1 Optical Properties

1.1 Luster

Vitreous, Resinous

Vitreous

1.2 Pleochroism

Faint

Present

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

TransparentAnthony et al, Handbook of mineralogy (2001)

Opaque, Translucent, Opaque . May be translucent in thin backlit sections.

1.5 Refractive Index

1.827-1.8791.695

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

1.8 Birefringence

0.042-0.0510.006-0.018

0 0.296

1.9 Clarity

TransparentAnthony et al

OpaqueHerve Nicolas Lazzarelli

Fayalite and Thulite Optic Character

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

Similar to their colors, Fayalite and Thulite 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.