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Antigorite
Antigorite

Atacamite
Atacamite



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Antigorite
X
Atacamite

Antigorite and Atacamite Optical Properties

Optical Properties

Luster

Waxy, Silky, Resinous, Greasy
Adamantine, Vitreous

Pleochroism

pale greenish yellow
X = pale green; Y = yellow-green; Z = grass-green

Dispersion

0.020.03
0.005 1
👆🏻

Transparency

Translucent
-

Refractive Index

1.530-1.5751.831
1 3.25
👆🏻

Optic Character

-
-

Crystal System

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

Birefringence

-99990.049
0 0.296
👆🏻

Clarity

Translucent
-

Antigorite and Atacamite Optic Character

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

Antigorite and Atacamite Transparency

Similar to their colors, Antigorite and Atacamite 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.