AM_Wickenburgite Formula: Pb3 Ca Al1.97 Fe.03 Si10 O27 H3 Name: Wickenburgite Unit cell: 8.56 8.56 20.19 90.0 90.0 120.0 , V=1281.19 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: UBC refinement