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Vivianite, an iron phosphate mineral, commonly contains substitutions of manganese and magnesium. Until now, it has not been clear which substituent is preferentially incorporated into vivianite, or how salinity affects substitution. These questions have been tackled in a new study by Joëlle Kubeneck, Laurel ThomasArrigo, Katherine Rothwell and Ruben Kretzschmar from ETH Soil Chemistry, with Ralf Kaegi from EAWAG, which is now published in the journal Geochimica et Cosmochimica Acta.