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Formula:   Pb5(PO4)3Cl  

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Crystal:   Hexagonal  
Hardness:   3.5-4  
Spec. Gr.:   7.04  
Streak:   White  
Cleavage:   Traces, m(101'0), x(101'1)  
Location:   Caldbeck Falls, Cumbria, (English Lake District)  

Pyromorphite is chemically a lead chloro- phosphate. It forms in aggregates of short six-sided prisms, which are frequently hollow. It also crystallizes in rounded or barrel-shaped forms. It is usually green, but also brown, gray or yellowish. It is found in the oxidized zone of lead deposits as a secondary mineral. Its name is derived from two Greek words meaning "fire" and "form." Good examples have come from the Wheatley mine, Phoenixville, Pennsylvania; Coeur d' Alene district, Idaho; and especially from the Roughton Gill mine, Caldbeck Falls, Cumbria, England.

Bibliography: Cooper, M.P., Pyromorphite Group minerals from the Caldbeck Falls, Cumbria, England.

Mineralogical Record, V, 22, #2, pp. 105-121.

University of California, Santa Barbara—Department of Earth Science
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