Berquo T. S. auteur aut IRD Imbernon R. A. L. auteur aut IRD Blot Alain auteur aut IRD Franco D. R. auteur aut IRD Toledo M. C. M. auteur aut IRD Partiti C. S. M. auteur aut IRD text journalArticle eng text/pdf born digital access In this work a magnetic characterization was made of natural goethite from Burkina Faso, Africa, by using low temperature magnetization curves, hysteresis loops, Mossbauer spectroscopy at room temperature and 4.2 K, and AC susceptibility from 10 to 400 K. The samples are from two distinct geological sites that underwent different weathering processes. All measurements point to the occurrence of typical high coercivity goethite. Through Mossbauer spectroscopy sample BL44, from Gangaol, northeast Burkina Faso showed relaxation effects due to a wide distribution of grain size, including superparamagnetism threshold. AC susceptibility also supports this interpretation. The sample BL50 from Bonga in Burkina Faso is associated with lateritic Ni and in addition to goethite this sample also contained magnetite, as determined by Verwey transition in low temperature measurements as well as a small content of hematite identified by Mossbauer spectroscopy. specialized Goethite Gossans Magnetization AC susceptibility Mossbauer spectroscopy 064 34 5 287-294 2007 0342-1791 https://www.documentation.ird.fr/hor/fdi:010040697 10.1007/s00269-007-0147-9 0342-1791 [F B010040697] https://www.documentation.ird.fr/hor/fdi:010040697 https://www.documentation.ird.fr/intranet/publi/2007/09/010040697.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2007-10-11 2017-08-23 fdi:010040697 fre