Two novel selenite oxychlorides Pb_(2)MCu(SeO_(3))_(4)Cl(H_(2)O) (M = Fe, Ga) were hydrothermally synthesized and structurally characterized. They are isostructural and crystallize in the two-dimensional [MCu(SeO_(3))_(4)Cl(H_(2)O)]~(4–) anionic layer structure mediated with ...