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Vivianite and Afghanite Optical Properties


Afghanite and Vivianite Optical Properties


Optical Properties

Luster
Vitreous, Pearly   
Vitreous   

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

Dispersion
Not Available   
Not Available   

Transparency
Transparent   
Transparent, Gemstones (2009)   

Refractive Index
1.560-1.640   
1.523   

Optic Character
Not Available   
Not Available   

Crystal System
Not Available   
Trigonal   

Birefringence
0.054-0.075   
0.006   

Clarity
Transparent   
Transparent   

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Vivianite and Afghanite Optic Character

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

Similar to their colors, Vivianite and Afghanite 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, Vivianite is Transparent while Vivianite is Transparent in appearance.

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