U. Schwertmann et J. Friedl, THIN IRON-OXIDE FILMS ON PEBBLES IN FERRIFERROUS STREAMS, Neues Jahrbuch fur Mineralogie Monatshefte, (2), 1998, pp. 63-67
Twelve ochreous, strongly adhering films at the surface of pebbles of
various lithology from Fe-containing streams had a minimum thickness o
f only several mu m, as calculated from the surface Fe concentration.
Goethite and ferrihydrite were identified by Mossbauer spectroscopy.