The rare iron-tin hydroxide minerals natanite and jeanbandyite occur as small pseudo-octahedral crystals in high-tcmperature Sn-Cu-As vcins at Penberthy Croft Mine and Hingston Downs Quail)', Cornwall. The lattice paramctcrs for jeanbandyite and natanite are reported and compared to previously calculated values. Thc chemical composition of jcanbandyite is discusscd and a significant proportion of divalent Fe and Mn is shown to be prcscnt.
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