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Pyrophyllite and Iolite Optical Properties


Iolite and Pyrophyllite Optical Properties


Optical Properties

Luster
Pearly   
Vitreous   

Pleochroism
NilArthur Thomas   
Not Available   

Dispersion
Not Available   
Not Available   

Transparency
Translucent   
Transparent, Translucent, Transparent to translucent   

Refractive Index
1.534-1.601   
1.52-1.56   

Optic Character
Not Available   
Not Available   

Crystal System
Not Available   
Orthorhombic   

Birefringence
0.050   
Not Available   

Clarity
Translucent   
Transparent to translucent   

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Pyrophyllite and Iolite Optic Character

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

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Pyrophyllite and Iolite Transparency

Similar to their colors, Pyrophyllite 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, Pyrophyllite is Translucent while Pyrophyllite is Translucent in appearance.

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