Antigorite and Sillimanite Optical Properties

Antigorite

Sillimanite

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Optical Properties

Luster

Waxy, Silky, Resinous, Greasy

Vitreous, Subadamantine, Silky

Pleochroism

pale greenish yellow

Colourless to pale brown to yellow

Dispersion

0.020.02

0.005 1

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Transparency

Translucent

Transparent, Translucent

Refractive Index

1.530-1.5751.653-1.685

1 3.25

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Optic Character

Crystal System

Monoclinic Domatic H-M Symbol (m) Space Group: Cm

Orthorhombic

Birefringence

-99990.020-0.022

0 0.296

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Clarity

Translucent

Transparent

Antigorite and Sillimanite Optic Character

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

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Antigorite and Sillimanite Transparency

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