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Peridot
Peridot

Sillimanite
Sillimanite



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Peridot
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Sillimanite

Peridot and Sillimanite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous, Greasy
Vitreous, Subadamantine, Silky
1.2 Pleochroism
Weak: yellow-green green (colorless)Herve Nicolas Lazzarelli
Colourless to pale brown to yellow
1.3 Dispersion
0.02NA
Fluorite Optical Properties
0.007 1
1.4 Transparency
Transparent
Transparent, Translucent
1.5 Refractive Index
1.64-1.691.653-1.685
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic
Orthorhombic
1.8 Birefringence
0.0360.020-0.022
Achroite
0 0.296
1.9 Clarity
Transparent
Transparent

Peridot and Sillimanite Optic Character

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

Similar to their colors, Peridot and Sillimanite 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.