AM_Cordierite_21 Formula: Mg1.834 Fe.204 Al3.97 Si4.992 O18.764 Na.084 C.192 H2 Name: Cordierite Unit cell: 17.0645 9.7281 9.3515 90.0 90.0 90.0 , V=1552.40 Space group: CCCM (66)

Malcherek T , Domeneghetti M C , Tazzoli V , Ottolini L , McCammon C A , Carpenter M A , American Mineralogist , 86 (2001) p.66-79, Structural properties of ferromagnesian cordierites, Sample: 126231 Tanzania