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Vivianite
Vivianite

Antigorite
Antigorite



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Vivianite
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Antigorite

Vivianite and Antigorite Optical Properties

Optical Properties

Luster

Vitreous, Pearly
Waxy, Silky, Resinous, Greasy

Pleochroism

Anomalous plechroism is strong with colours deep blue/pale yellowish green/yellowish green.Michael O’Donoghue
pale greenish yellow

Dispersion

0.030.02
0.005 1
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Transparency

Transparent
Translucent

Refractive Index

1.560-1.6401.530-1.575
1 3.25
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Optic Character

-
-

Crystal System

-
Monoclinic Domatic H-M Symbol (m) Space Group: Cm

Birefringence

0.054-0.075-9999
0 0.296
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Clarity

Transparent
Translucent

Vivianite and Antigorite Optic Character

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

Vivianite and Antigorite Transparency

Similar to their colors, Vivianite and Antigorite 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.