AM_Cordierite_10 Formula: Mg1.162 Fe.732 Al3.848 Si4.835 O18.77 H.77 Name: Cordierite Unit cell: 17.098 9.741 9.319 90.0 90.0 90.0 , V=1552.09 Space group: CCCM (66)

Wallace J H , Wenk H R , American Mineralogist , 65 (1980) p.96-111, Structure variation in low cordierites, sci 1104