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Campylite is a variety of the mineral pyromorphite, distinguished by distorted crystals with curved faces. Pyromorphite itself is a lead chloride phosphate mineral that serves as a minor ore of lead. It is found in the oxidized zones of lead deposits, often forming brightly colored, barrel-shaped crystals or globular masses.12

Pyromorphite can contain arsenic and vanadium, which replace phosphorus in its crystal structure, leading to solid-solution series with other minerals like mimetite and vanadinite. Mimetite is an arsenate mineral where arsenic replaces phosphorus, and vanadinite contains vanadium in place of arsenic.12

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