Neall, Tim; Tindle, Andrew G. and Green, D. I.
The first British occurrence of arsendescloizite at Sandbed mine, Caldbeck Fells, Cumbria.
UK Journal of Mines and Minerals, 27
The rare lead zinc arsenate arsendescloizite occurs as pale green crusts associated with calcium-rich mimetite at Sandbed Mine in the Caldbeck Fells, Cumbria. Quantitative chemical analyses show significant substitution of calcium for lead and of copper for zinc. They produce a chemical formula that can be written: (Na0.07,Pb0.71,Ca0.22)(Zn0.73,Cu0.27)[(AsO4)0.94,(PO4)0.04,(VO4)0.01)](OH)0.97, which is remarkably close to the ideal adelite-descloizite group formula. This is the first report of arsendescloizite in the British Isles.
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