Original paper
Green mawbyite, PbFe3+Fe2+0.4Zn0.6(AsO4)2OH(H2O), from the Lagoa mine, northern Portugal
Alves, Pedro; Mumme, W. Gus; Grey, Ian E.; MacRae, Colin M.; Gable, Robert W.
Neues Jahrbuch für Mineralogie - Abhandlungen Band 196 Heft 2 (2019), p. 129 - 133
9 references
published: Nov 18, 2019
published online: Aug 9, 2019
manuscript accepted: Jul 2, 2019
manuscript revision received: May 28, 2019
manuscript revision requested: May 24, 2019
manuscript received: Apr 4, 2019
ArtNo. ESP154019602002, Price: 29.00 €
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+0.4Zn0.6(AsO4)2OH(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.