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Ferrimolybdite in Divino de Ubá pegmatite, Minas Gerais, Brazil

Ferrimolybdite is a hydrated ferric molybdate, with a uncertain water content, probably Fe2(MoO4)3 • 8H2O, and is a secondary mineral, commonly formed by the alteration of molybdenite. Ferrimolybdite was found as a greenish-yellow coating on well developed crystals of samarskite and euxenite in Divino de Ubá pegmatite, in southeast of Minas Gerais State, Brazil. SEM analysis of sample, combined with EDS confirmed that sample is built of iron and molybdenum. Such result could be interpreted as ferrimolybdite, but more accurate chemical composition and diffraction data would lead to better description of this extremely rare described mineral species. Although molybdenite is a common mineral in Brazilian emerald deposits, but molybdenum rich mineral species are uncommon in granitic pegmatites. This is the first report of ferrimolybdite in Brazilian pegmatites.

Ferrimolybdite; Divino de Ubá pegmatite; Brazil

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