AM_Hercynite_21 Formula: (Al1.99 Mg.816 Fe.194) O4 Name: Hercynite Unit cell: 8.1006 8.1006 8.1006 90.0 90.0 90.0 , V=531.56 Space group: FD3M (227)

Andreozzi G B , Lucchesi S , American Mineralogist , 87 (2002) p.1113-1120, Intersite distribution of Fe2+ and Mg in the spinel (sensu stricto) -, hercynite series by single-crystal X-ray diffraction, Sample: He4a/c