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Transmission electron micrographs of the different Fe-oxyhydroxide and Mn oxide particles observed in the Ula Nui mat and crust. (a) A variety of branched, twisted, stick-like and spherical materials. (b, c) Sticks and ball-like structures. (d) Bent stick structures. Scale bars: a, c and d=2 μm; b=1 μm.
