AM_Wickenburgite_1 Formula: Pb3 Ca Al1.81 Fe.19 Si10 O27 H3 Name: Wickenburgite Unit cell: 8.546 8.546 20.168 90.0 90.0 120.0 , V=1275.61 Space group: P31C (159)

Lam A E , Groat L A , The Canadian Mineralogist , 32 (1994) p.525-532, The crystal structure of wickenburgite, Pb3CaAl[AlSi10O27](H2O)3, a sheet, structure, Sample: UMAN refinement