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Pyromorphite

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pyromorphite [¦pī·rō′mȯr‚fīt]
(mineralogy)
Pb5(PO4)3Cl A green, yellow, brown, gray, or white mineral of the apatite group, crystallizing in the hexagonal system; a minor ore of lead. Also known as green lead ore.
Pyromorphite 

a mineral with the formula Pb5[PO4]3Cl. Pyromorphite contains 82.0 percent PbO, 15.4 percent P2O5, and 2.6 percent Cl. Sometimes it has admixtures of As, which substitutes for phosphorus. Pyromorphite crystallizes in the hexagonal system, forming prismatic or barrel-shaped crystals and, more rarely, granular, fibrous, and sintered aggregates. It has a hardness of 3.5–4 on Mohs’ scale and a density of 6,700–7,100 kg/m3. Pyromorphite is a brittle mineral. Its color is usually various shades of green, occasionally yellow, orange, or some other color.

Pyromorphite occurs in oxidation zones of lead and lead-zinc deposits. It is also associated with other lead minerals, such as cerussite, anglesite, mimetite, vanadinite, and wulfenite. Pyromorphite does not form large aggregates. It is used, along with other lead minerals, in the extraction of metallic lead.
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The first went to Ed Bing Lee, of Philadelphia, for his fiber piece titled Pyromorphite Noir.
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Many investigators have provided conclusive evidence for the ability of phosphate to immobilise dissolved Pb in contaminated soils through precipitation as fluoropyromorphite, pyromorphite, hydroxypyromorphite, and chloropyromorphite, and as hopeite in the case of Zn (Bolan et al.
Role of inorganic and organic soil amendments on immobilisation and ... by Bolan, N. S.; Duraisamy, V. P. / Australian Journal of Soil Research
The original material was almost entirely converted to corrosion products, identified by X-ray diffraction as pyromorphite (lead phosphate chloride, forming a friable outer skin) and cerussite (lead carbonate, present as a harder core).
Early Bronze Age lead - a unique necklace from southeast Scotland by Hunter, Fraser; Davis, Mary / Antiquity
 
 
 
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