Iron(II) phosphate
Iron(II) phosphate, also ferrous phosphate, Fe3(PO4)2, is an iron salt of phosphoric acid. Natural occurrences 
The mineral vivianite is a naturally occurring form of hydrated iron(II) phosphate. Production
It can be formed by the reaction of ferrous hydroxide with phosphoric acid to produce hydrated iron(II) phosphate. See also
Iron(III) phosphate

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Phosphates
Iron(II) compounds