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Anthophyllite and Iolite Optical Properties


Iolite and Anthophyllite Optical Properties


Optical Properties

Luster
Vitreous, Pearly   
Vitreous   

Pleochroism
When Fe-rich   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
Transparent   
Transparent, Translucent, Transparent to translucent   

Refractive Index
1.603-1.690   
1.52-1.56   

Optic Character
Biaxial/+   
Not Available   

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

Birefringence
Not Available   
Not Available   

Clarity
Transparent   
Transparent to translucent   

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Anthophyllite and Iolite Optic Character

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

Similar to their colors, Anthophyllite and Iolite 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, Anthophyllite is Transparent while Anthophyllite is Transparent in appearance.

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