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siderotil:see ferrous sulfateferrous sulfate
or iron (II) sulfate,
chemical compound, FeSO4. It is known as the monohydrate, FeSO4·H2O; the tetrahydrate, FeSO4·4H2O; the pentahydrate, FeSO4·5H2
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(Cu,Fe)SO4·5H2O A white to yellowish or pale greenish-white mineral consisting of ferrous sulfate pentahydrate; occurs as fibrous crusts and groups of needlelike crystals.