AM_Magnocolumbite Formula: Mg Nb2 O6 Name: Magnocolumbite Unit cell: 14.1875 5.7001 5.0331 90.0 90.0 90.0 , V=407.03 Space group: PBCN (60)

Pagola S , Carbonio R E , Alonso J A , Fernandez-Diaz M T , Journal of Solid State Chemistry , 134 (1997) p.76-84, Crystal structure refinement of Mg Nb2 O6 columbite from neutron powder, diffraction data and study of the ternary system MgO-Nb2O5-NbO, with evidence, of formation of new reduced pseudobrookite Mg5-xNb4+xO15-d (1.14