AM_Stewartite Formula: Mn Fe2 P2 O18 H18 Name: Stewartite Unit cell: 10.398 10.672 7.223 90.1 109.1 71.83 , V=715.12 Space group: P-1 (2)

Moore P B , Araki T , American Mineralogist , 59 (1974) p.1272-1276, Stewartite, MnFe2(OH)2(H2O)6[PO4]2.2H2O: Its atomic arrangement