AM_Bannisterite_1 Formula: Mn12.44 Fe2.9 Mg2.86 Zn2.02 Si29.648 Al2.352 O103.69 Ca K.76 H58 Name: Bannisterite Unit cell: 22.265 16.368 24.668 90.0 94.285 90.0 , V=8964.72 Space group: A12/A1 (15)

Heaney P J , Post J E , Evans H T , Clays and Clay Minerals , 40 (1992) p.129-144, The crystal structure of bannisterite, Locality: Franklin Furnace, New Jersey, USA