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Astrophyllite and Vivianite Optical Properties


Vivianite and Astrophyllite Optical Properties


Optical Properties

Luster
Greasy, Pearly   
Vitreous, Pearly   

Pleochroism
Strong: X= deep red-orange Y= orange-yellow Z= lemon-yellow   
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
1.678-1.758   
1.560-1.640   

Optic Character
Not Available   
Not Available   

Crystal System
Triclinic   
Not Available   

Birefringence
0.050   
0.054-0.075   

Clarity
Translucent   
Transparent   

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Astrophyllite and Vivianite Optic Character

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

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

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