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Fayalite
Fayalite

Zoisite
Zoisite



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Fayalite
X
Zoisite

Fayalite and Zoisite Optical Properties

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Optical Properties

Luster

Vitreous, Resinous
Vitreous

Pleochroism

Faint
X = pale pink to red-violet; Y = nearly colorless to bright pink or deep blue; Z = pale yellow to yellow-green

Dispersion

0.030.02
0.005 1
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Transparency

TransparentAnthony et al
Transparent, Translucent, Opaque . May be translucent in thin backlit sections.

Refractive Index

1.827-1.8791.685-1.707
1 3.25
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Optic Character

-
-

Crystal System

Orthorhombic
Orthorhombic

Birefringence

0.042-0.0510.006-0.018
0 0.296
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Clarity

TransparentAnthony et al
Transparent

Fayalite and Zoisite Optic Character

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

Fayalite and Zoisite Transparency

Similar to their colors, Fayalite and Zoisite 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 TransparentAnthony et al while Fayalite is TransparentAnthony et al in appearance.