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Fayalite
Fayalite

Peridot
Peridot



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Fayalite
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Peridot

Fayalite and Peridot Optical Properties

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Optical Properties

Luster

Vitreous, Resinous
Vitreous, Greasy

Pleochroism

Faint
Weak: yellow-green green (colorless)Herve Nicolas Lazzarelli

Dispersion

0.030.02
0.005 1
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Transparency

TransparentAnthony et al
Transparent

Refractive Index

1.827-1.8791.64-1.69
1 3.25
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Optic Character

-
-

Crystal System

Orthorhombic
Orthorhombic

Birefringence

0.042-0.0510.036
0 0.296
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Clarity

TransparentAnthony et al
Transparent

Fayalite and Peridot Optic Character

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

Similar to their colors, Fayalite and Peridot 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.