Beudandite is a secondary mineral occurring in the oxidized zones of polymetallic deposits.

[4] It is a lead, iron, arsenate, sulfate with endmember formula: PbFe3(OH)6SO4AsO4.

It occurs in association with carminite, scorodite, mimetite, dussertite, arseniosiderite, pharmacosiderite, olivenite, bayldonite, duftite, anglesite, cerussite and azurite.

[4] Beudantite was first described in 1826 for an occurrence in the Louise Mine, Wied Iron Spar District, Westerwald, Rhineland-Palatinate, Germany.

It was named by Armand Lévy after his fellow Frenchman and mineralogist François Sulpice Beudant (1787–1850).