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 a reference to the amarantite spectrum

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updated 4-Jul-2022