Dumortierite and Antigorite Optical Properties

Dumortierite

Antigorite

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Optical Properties

Luster

Vitreous

Waxy, Silky, Resinous, Greasy

Pleochroism

Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue

pale greenish yellow

Dispersion

0.010.02

0.005 1

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Transparency

Translucent, Translucent to opaque

Translucent

Refractive Index

1.669-1.7231.530-1.575

1 3.25

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Optic Character

Crystal System

Orthorhombic

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

Birefringence

0.011-0.037-9999

0 0.296

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Clarity

Translucent

Dumortierite and Antigorite Optic Character

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

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