AM_Hercynite_20 Formula: Al1.999 Mg.89 Fe.111 O4 Name: Hercynite Unit cell: 8.0937 8.0937 8.0937 90.0 90.0 90.0 , V=530.20 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: He3a/b