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Title: The supergene origin of ruthenian hexaferrum in Ni-laterites
Author: Aiglsperger, Thomas Hans
Proenza Fernández, Joaquín Antonio
Galí Medina, Salvador, 1949-
Rius, Jordi
Longo, Francisco
Domènech Ortí, Cristina
Keywords: Compostos de níquel
Nickel compounds
Issue Date: 1-Apr-2017
Publisher: John Wiley & Sons
Abstract: For 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.
Note: Versió postprint del document publicat a:
It is part of: Terra Nova, 2017, vol. 29, num. 2, p. 106-116
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ISSN: 0954-4879
Appears in Collections:Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

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