Lowell, Wayne R. Formerly, Department of Geology, Indiana University, Bloomington, Indiana.
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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.
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