Structural characteristics of hematite and
Goethite and hematite structures are based upon hexagonal close packed layers of oxygen or/and hydroxy 1 groups, giving a common sublattice, within which the octedral vacancy fil¬ ling scheme differs according to the phase (Goldsztaub, 1931 ; Bernai et al., 1959 ; Francombe and Rooksby, 1959). Yet, the anion net retains similar parameters in two directions.