AM_Chamosite
Formula: (Mg2.518 Fe2.482) Al1.2 Si3.8 O18 H10
Name: Chamosite
Unit cell: 5.36982 9.3031 14.261 90.315 97.234 90.022 , V=706.74
Space group: C-1 (2)

Walker J R , Bish D L , Clays and Clay Minerals , 40 (1992) p.319-322, Application of Rietveld refinement techniques to a disordered IIb Mg-chamosite, Locality: Lebanon, New Hampshire, USA