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Peridot
Peridot

Pargasite
Pargasite



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Peridot
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Pargasite

Peridot and Pargasite Optical Properties

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Optical Properties

Luster

Vitreous, Greasy
Vitreous

Pleochroism

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

Dispersion

0.020.02
0.005 1
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Transparency

Transparent
Transparent

Refractive Index

1.64-1.691.613-1.663
1 3.25
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Optic Character

-
-

Crystal System

Orthorhombic
monoclinic

Birefringence

0.0360.020
0 0.296
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Clarity

Transparent
Transparent

Peridot and Pargasite Optic Character

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

Peridot and Pargasite Transparency

Similar to their colors, Peridot and Pargasite 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, Peridot is Transparent while Peridot is Transparent in appearance.