AM_Kidwellite Formula: Na Fe9 (P5.524 As.476) Cu.356 O38 H19 Name: Kidwellite Unit cell: 20.117 5.185 13.978 90.0 107.07 90.0 , V=1393.77 Space group: P12/C1 (13)

Kolitsch U , Mineralogical Magazine , 68 (2004) p.147-165, The crystal structures of kidwellite and laubmannite , two complex fibrous, iron phosphates, Locality: Clara mine, Black Forest, Germany