AM_Cordierite_9 Formula: Mg1.252 Fe1.252 Al3.836 Si4.83 O18.58 H.58 Name: Cordierite Unit cell: 17.114 9.761 9.333 90.0 90.0 90.0 , V=1559.08 Space group: CCCM (66)

Wallace J H , Wenk H R , American Mineralogist , 65 (1980) p.96-111, Structure variation in low cordierites, sci 1018