AM_Cordierite_20 Formula: Mg1.984 Fe.034 Al3.982 Si5 O18.54 Na.044 H2 Name: Cordierite Unit cell: 17.0568 9.7154 9.3472 90.0 90.0 90.0 , V=1548.96 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: 1997-1 SE-India