AM_Cordierite_11 Formula: (Mg4 Fe4) Al7.802 Si5.998 O20.12 H2.12 Name: Cordierite Unit cell: 17.14 9.769 9.321 90.0 90.0 90.0 , V=1560.71 Space group: CCCM (66)

Wallace J H , Wenk H R , American Mineralogist , 65 (1980) p.96-111, Structure variation in low cordierites, sci 552