A mineral series in the apatite group, or in the larger grouping of phosphate, arsenate, and vanadate-type minerals. In this series lead (Pb) substitutes for calcium (Ca) of the apatite formula Ca₅(PO₄)₃(F,OH,Cl), and little fluorine (F) or hydroxide (OH) is present. Substitution between phosphorus (P) and arsenic (As) gives rise to a complete mineral series with pyromorphite, Pb₅(PO₄)₃Cl, and mimetite, Pb₅(AsO₄)Cl, as pure end members. Substitution between As and vanadium (V) produces another series between mimetite and vanadinite, Pb₅(VO₄)₃Cl.