Abstract
Alteration of Fe-bearing pyrophanite from a manganese oxide deposit (Conta HistOria) in the Quadrilatero Ferrifero of Minas Gerais, Brazil, was investigated by electron-microprobe analysis. The microanalyses suggestthat the alteration products range in composition from Mn-deficient pyrophanite to a hypothetical Mn-rich pseudorutile-like mineral. In the sample material analysed, crystals of Fe-bearing pyrophanite cut by gibbsite-filled veinlets and vugs are altered, whereas Mn-rich ilmenite from gibbsite pseudomorphs after garnet remains unaltered.
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