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Biotite and Pyrophyllite Optical Properties


Pyrophyllite and Biotite Optical Properties


Optical Properties

Luster
Vitreous, Pearly   
Pearly   

Pleochroism
Strong   
NilArthur Thomas   

Dispersion
Not Available   
Not Available   

Transparency
Not Available   
Translucent   

Refractive Index
1.565-1.625   
1.534-1.601   

Optic Character
Not Available   
Not Available   

Crystal System
monoclinic   
Not Available   

Birefringence
0.03-0.07   
0.050   

Clarity
Not Available   
Translucent   

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Biotite and Pyrophyllite Optic Character

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

Similar to their colors, Biotite and Pyrophyllite 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, Biotite is Not Available while Biotite is Not Available in appearance.

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