AM_Bementite Formula: Si6 Mn6.683 O23 Name: Bementite Unit cell: 14.838 17.584 14.7 90.0 95.54 90.0 , V=3817.48 Space group: P121/C1 (14)

Heinrich A R , Eggleton R A , Guggenheim S , American Mineralogist , 79 (1994) p.91-106, Structure and polytypism of bementite, a modulated layer silicate