Aiglsperger, Thomas HansProenza Fernández, Joaquín AntonioGalí Medina, Salvador, 1949-Rius, JordiLongo, FranciscoDomènech Ortí, Cristina2020-05-152020-05-152017-04-010954-4879https://hdl.handle.net/2445/160517For two decades, the nature of Fe-rich, oxygen-bearing, Ru-Os compounds found in the supergene environment has been debated. Ru-Os-Fe-oxides and nano-intergrowths of ruthenium with magnetite have been proposed. We applied FE-SEM, EMPA, mu-Raman spectroscopy and synchrotron tts-lXRD to Ru-Os-Fe compounds recovered from Ni-laterites from the Dominican Republic. The results demonstrate that a significant portion of Fe exists in a common structure with the Ru-Os alloy, that is, ruthenian hexaferrum. This mineral occurs both as nanoparticles and as micrometric patches within a matrix of Fe-oxide(s). Our data suggest that supergene ruthenian hexaferrum with a (Ru-0.4(Os, Ir)(0.1)Fe-0.5)(Sigma 1.0) stoichiometry represents the most advanced weathering product of primary laurite within Ni-laterites from the Dominican Republic.20 p.application/pdfeng(c) John Wiley & Sons, 2017Compostos de níquelLateritaNickel compoundsLateriteinfo:eu-repo/semantics/article6775022020-05-15info:eu-repo/semantics/openAccess