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Type Locality:
Isostructural with:
Apatite group,apatite supergroup.
Mimetite-pyromorphite series.
The phosphate analogue ofmimetite andvanadinite.
A secondary lead mineral found in the oxidised zones of lead deposits. Typically found as green, yellowish, brownish, greyish or white barrel-shaped hexagonal prisms, in clusters or as druses on matrix. The individual crystals are often modified or etched, giving a hopper-like appearance. This lead chloride phosphate forms a complete series withmimetite (lead chloride arsenate), and many specimens are intermediates between the two end-members.
"Ca-rich pyromorphite" may bephosphohedyphane.
Also forms a series withhydroxylpyromorphite andfluorpyromorphite.
Baker (1966) showed by synthesis that there is a complete series betweenmimetite, pyromorphite andvanadinite.
A rather stable Pb phase also forming in contaminated urban and industrial soils, was shown by Sayer et al. (1999) to be solubilized by organic-acid-forming fungi (Aspergillus niger), thus forming oxalates:'unnamed (Pb oxalate)' and'unnamed (Pb oxalate dihydrate)'. These oxalates, although insoluble and thus immobilizing Pb, are predicted to be thermodynamically unstable in many soils.
Visit gemdat.org forgemological information about Pyromorphite.
Mimetite-pyromorphite series.
The phosphate analogue ofmimetite andvanadinite.
A secondary lead mineral found in the oxidised zones of lead deposits. Typically found as green, yellowish, brownish, greyish or white barrel-shaped hexagonal prisms, in clusters or as druses on matrix. The individual crystals are often modified or etched, giving a hopper-like appearance. This lead chloride phosphate forms a complete series withmimetite (lead chloride arsenate), and many specimens are intermediates between the two end-members.
"Ca-rich pyromorphite" may bephosphohedyphane.
Also forms a series withhydroxylpyromorphite andfluorpyromorphite.
Baker (1966) showed by synthesis that there is a complete series betweenmimetite, pyromorphite andvanadinite.
A rather stable Pb phase also forming in contaminated urban and industrial soils, was shown by Sayer et al. (1999) to be solubilized by organic-acid-forming fungi (Aspergillus niger), thus forming oxalates:'unnamed (Pb oxalate)' and'unnamed (Pb oxalate dihydrate)'. These oxalates, although insoluble and thus immobilizing Pb, are predicted to be thermodynamically unstable in many soils.
Visit gemdat.org forgemological information about Pyromorphite.
