Investigations on FCAM-III (Ca2.38Mg2.09Fe3+10.61Fe2+1.59Al9.33O36): A new homologue of the aenigmatite structure-type in the system CaO-MgO-Fe2O3-Al2O3

The crystal structure of the new FCAM-III phase (Ca2.38Mg2.09Fe3+10.61Fe2+1.59Al9.33O36) is a member of the homologous series M14+6nO20+8n with n = 2. The projection is parallel to the b-axis.315