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Mellite and Pyrophyllite Optical Properties


Pyrophyllite and Mellite Optical Properties


Optical Properties

Luster
Vitreous   
Pearly   

Pleochroism
Weak: yellowish brown yellowAnthony et al   
NilArthur Thomas   

Dispersion
Not Available   
Not Available   

Transparency
Gemmological Tables (2004) More from other references   
Translucent   

Refractive Index
1.509-1.541   
1.534-1.601   

Optic Character
Not Available   
Not Available   

Crystal System
Not Available   
Not Available   

Birefringence
0.030   
0.050   

Clarity
TransparentUlrich Henn and Claudio C. Milisenda   
Translucent   

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Mellite and Pyrophyllite Optic Character

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

Similar to their colors, Mellite 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, Mellite is Gemmological Tables (2004) More from other references while Mellite is Gemmological Tables (2004) More from other references in appearance.

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