Amarantite Visible Spectrum (300 - 1300 nm)

Fe₂(SO₄)₂O·7H₂O. It is noteworthy in that it has a tetramer of four 6-coordinate Fe³⁺ ions sharring two common oxide ions  that allows magnetic interactions among the ions resulting in enhanced absorption band intensity.

The amarantite absorption spectrum

• Amarantite; GRR 187, a 0.014 mm thick orange-red crystal      from Sierra Gorda, Chile, NMNH R6254.

Link to a reference to the amarantite spectrum

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updated 4-Jul-2022