Amarantite Visible Spectrum (300 - 1300 nm)

Amarantite is a hydrated ferric phosphate, Fe2(SO4)2O7H2O. It is noteworthy in that it has a tetramer of four 6-coordinate Fe3+ ions sharring two common oxide ions Amarantite structure that allows magnetic interactions among the ions resulting in enhanced absorption band intensity.

The amarantite absorption spectrum

Link to references to the amarantite spectrum

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updated 4-Jul-2022