AM_Cordierite_18 Formula: Si5 Al4 (Mg1.836 Fe.164) Na.07 O18.59 Name: Cordierite Unit cell: 17.069 9.725 9.347 90.0 90.0 90.0 , V=1551.56 Space group: CCCM (66)

Geiger C A , Armbruster T , Khomenko V , Quartieri S , American Mineralogist , 85 (2000) p.1255-1264, Cordierite I: The coordination of Fe2+, Sample: 42/IA