Feroxyhyte Francombe M H, Rooksby H P Clay Minerals Bulletin 4 (1959) 1-14 Structure transformations effected by the dehydration of diaspore, goethite and delta ferric oxide Locality: synthetic _database_code_amcsd 0021199 2.95 2.95 4.53 90 90 120 P-3m1 atom x y z occ Biso Fe1 0 0 0 .3333 Fe2 0 0 .5 .3333 Fe3 1/3 2/3 0 .0833 Fe4 1/3 2/3 .5 .0833 O 1/3 2/3 .25 .5 OH 2/3 1/3 .75 .5