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Franklinite and Vivianite Optical Properties


Vivianite and Franklinite Optical Properties


Optical Properties

Luster
Not Available   
Vitreous, Pearly   

Pleochroism
Not Available   
Anomalous plechroism is strong with colours deep blue/pale yellowish green/yellowish green.Michael O’Donoghue   

Dispersion
Not Available   
Not Available   

Transparency
Translucent   
Transparent   

Refractive Index
Not Available   
1.560-1.640   

Optic Character
Not Available   
Not Available   

Crystal System
Isometric Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m   
Not Available   

Birefringence
Not Available   
0.054-0.075   

Clarity
Translucent   
Transparent   

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Franklinite and Vivianite Optic Character

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

Similar to their colors, Franklinite and Vivianite 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, Franklinite is Translucent while Franklinite is Translucent in appearance.

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