Article
Article
Pyromorphite
Article By:
Lowell, Wayne R. Formerly, Department of Geology, Indiana University, Bloomington, Indiana.
Last reviewed:December 2019
DOI:https://doi.org/10.1036/1097-8542.560000
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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