The uncommon, lead-aluminium phosphate hydroxide mineral plumbogummite is reported here, for the first time in the Pennine orefields, derived from a highly oxidized lead-rich vein at Grasshill mines, Upper Teesdale, Co. Durham. The plumbogummite is undoubtedly supergene in origin, but whether it formed along with associated pyromorphite through natural, in situ weathering, or is a post-mining, dump-formed alteration product is unclear.

You do not currently have access to this article.