AM_Cordierite_17 Formula: Si5 Al4 (Mg1.86 Fe.14) Na.09 O18.58 Name: Cordierite Unit cell: 17.072 9.727 9.351 90.0 90.0 90.0 , V=1552.82 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: DA-1