Pyromorphite

Phosphate mineral,apatite group

Pyromorphite is a mineral chlorophosphate: Pb , sometimes occurring in sufficient abundance to be mined as an ore of lead. Crystals are common, and have the form of a hexagonal prism terminated by the basal planes , sometimes combined with narrow faces of a hexagonal pyramid. Crystals with a barrel-like curvature are not uncommon. Globular and reniform masses are also found. It is part of a series with two other minerals: mimetite O4)3Cl) and vanadinite O4)3Cl), the resemblance in external characters is so close that, as a rule, it is only possible to distinguish between them by chemical tests. They were formerly confused under the names green lead ore and brown lead ore (German: Grünbleierz and Braunbleierz).

The phosphate was first distinguished chemically by M. H. Klaproth and it was named pyromorphite by J. F. L. Hausmann The name is derived from the Greek for pyr (fire) and morfe (form) due to its crystallization behavior after being melted.

Paecilomyces javanicus collected from a lead-polluted soil that is able to form biominerals of pyromorphite.