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Antigorite
Antigorite

Mottramite
Mottramite



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Antigorite
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Mottramite

Antigorite and Mottramite Optical Properties

Optical Properties

Luster

Waxy, Silky, Resinous, Greasy
Greasy

Pleochroism

pale greenish yellow
Visible X=Y= canary yellow to greenish yellow

Dispersion

0.020.04
0.005 1
👆🏻

Transparency

Translucent
-

Refractive Index

1.530-1.5752.170
1 3.25
👆🏻

Optic Character

-
-

Crystal System

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

Birefringence

-99990.150
0 0.296
👆🏻

Clarity

Translucent
-

Antigorite and Mottramite Optic Character

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

Similar to their colors, Antigorite and Mottramite 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.