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The supergene origin of ruthenian hexaferrum in Ni-laterites
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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.
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AIGLSPERGER, Thomas Hans, et al. The supergene origin of ruthenian hexaferrum in Ni-laterites. Terra Nova. 2017. Vol. 29, num. 2, pags. 106-116. ISSN 0954-4879. [consulted: 19 of August of 2026]. Available at: https://hdl.handle.net/2445/160517