Vivianite Visible Spectra (300 - 1800 nm)

The iron phosphate mineral, vivianite, is unusual in that, when ground, the green mineral will turn dark blue due to partial oxidation. The origin of color in vivianite is iron. In this structure, most of the iron is Fe2+ which causes the green color seen in many specimens. If some of the iron is Fe3+ it will interact with the Fe2+ to both increase the intensity of the Fe2+ absorption and to cause Fe2+ - Fe3+ intervalance charge transfer. These two processes cause the blue color of partially oxidized vivianite.

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