<Tr> <Td_colspan="2"> Infobox references </Td> </Tr> <Tr> <Td> </Td> <Td> </Td> </Tr> <P> Ammonium iron (II) sulfate, or Mohr's salt, is the inorganic compound with the formula (NH) Fe (SO) 6H O. Containing two different cations, Fe and NH, it is classified as a double salt of ferrous sulfate and ammonium sulfate . It is a common laboratory reagent because it is readily crystallized, and crystals resist oxidation by air . Like the other ferrous sulfate salts, ferrous ammonium sulfate dissolves in water to give the aquo complex (Fe (H O)), which has octahedral molecular geometry . </P> <P> This compound is a member of a group of double sulfates called Schönites or Tutton's salts . Tutton's salts form monoclinic crystals and have formula M N (SO) 6H O (M = various monocations). With regards to the bonding, crystals consist of octahedra (Fe (OH)) centers, which are hydrogen bonded to sulfate and ammonium . </P>

What is the formula of ferrous ammonium sulphate
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