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Sugilite
Sugilite

Peridot
Peridot



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Sugilite
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Peridot

Sugilite and Peridot Optical Properties

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Optical Properties

Luster

Vitreous
Vitreous, Greasy

Pleochroism

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

Dispersion

0.020.02
0.005 1
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Transparency

Translucent
Transparent

Refractive Index

1.607-1.6121.64-1.69
1 3.25
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Optic Character

-
-

Crystal System

Hexagonal
Orthorhombic

Birefringence

0.0030.036
0 0.296
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Clarity

Translucent
Transparent

Sugilite and Peridot Optic Character

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

Sugilite and Peridot Transparency

Similar to their colors, Sugilite 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, Sugilite is Translucent while Sugilite is Translucent in appearance.