Abstract
An occurrence of an unusual, green-coloured mawbyite was found coating arsenopyrite in a specimen from the Lagoa mine, Northern Portugal. Electron microprobe analyses combined with a single-crystal structure refinement gives the formula as PbFe3+ Fe2+ 0.4 Zn 0.6 (AsO 4) 2 O H(H2O). The change of color from the usual bright red or orange color of mawbyite is attributed to the high concentration of divalent cations, Fe2+ and Zn, in the metal atom site.
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