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Antigorite and Anthophyllite Optical Properties


Anthophyllite and Antigorite Optical Properties


Optical Properties

Luster
Waxy, Silky, Resinous, Greasy   
Vitreous, Pearly   

Pleochroism
pale greenish yellow.   
When Fe-rich   

Dispersion
Not Available   
Not Available   

Transparency
Translucent   
Transparent   

Refractive Index
1.530-1.575   
1.603-1.690   

Optic Character
Not Available   
Biaxial/+   

Crystal System
Monoclinic Domatic H-M Symbol (m) Space Group: Cm   
Orthorhombic Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma   

Birefringence
Not Available   
Not Available   

Clarity
Translucent   
Transparent   

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Antigorite and Anthophyllite Optic Character

Antigorite and Anthophyllite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Antigorite and Anthophyllite 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 Anthophyllite 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. Anthophyllite has Biaxial/+ character.

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Antigorite and Anthophyllite Transparency

Similar to their colors, Antigorite and Anthophyllite 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.

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