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| Formula: | Pb5(PO4)3Cl |  Click to see a larger image |
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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. |
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Bibliography: Cooper, M.P., Pyromorphite Group minerals from the Caldbeck Falls, Cumbria, England. Mineralogical Record, V, 22, #2, pp. 105-121. |
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