AM_Jacobsite_2 Formula: Mg.129 Mn.832 Fe2.004 Zn.007 Al.03 O4 Name: Jacobsite Unit cell: 8.4956 8.4956 8.4956 90.0 90.0 90.0 , V=613.17 Space group: FD3M (227)

Lucchesi S , Russo U , Della Giusta A , European Journal of Mineralogy , 9 (1997) p.31-42, Crystal chemistry and cation distribution in some, Mn-rich natural and synthetic spinels, Sample: JBS4