AM_K(H2O)Fe(H15AsO4)2(H2AsO4) Formula: K O13 Fe As3 H7 Name: K(H2O)Fe(H1.5AsO4)2(H2AsO4) Unit cell: 4.7 8.712 13.828 90.0 94.86 90.0 , V=564.17 Space group: P12/N1 (13)

Schwendtner K , Kolitsch U , European Journal of Mineralogy , 19 (2007) p.399-409, Two new structure types: KFe3(AsO4)2(HAsO4)2 and K(H2O)M3+(H1.5AsO4)2(H2AsO4), (M3+ = Fe, Ga, In) - synthesis, crystal structure and spectroscopy