Abstract
Fe 2F 5(H 2O) 2 is related to the weberite structure, whose space group is not clearly defined. A careful reexamination of the structure confirms and refines the previous results: Fe 2F 5(H 2O) 2 belongs to the space group Imma with cell parameters a = 7.477(1) Å, b = 10.862(2) Å, c = 6.652(1) Å ( Z = 4). The structure has been refined from 379 reflections to R = 0.029 ( R w = 0.034). Fe 2F 5(H 2O) 2 must be considered as an antiweberite structure since M 2+ and M 3+ positions are inverse of those of the weberite structure.
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