We have identied the presence of Fe oxides, clays and other minerals in the clay fractions of six samples gathered at three pits practiced in soils of sugar cane plantations of the agroindustrial company Pomalca S.A.A. These plantations are located in the District of Pomalca, Province of Chiclayo, Lambayeque Region, Peru. The pits were identied as: Estrella, Estreno and Mochica. The X-ray diractometry and transmission Mössbauer spectroscopy techniques, complemented with routine physical-chemical analyses, allowed us to obtain results that resolved the identication of the structural and mineralogi- cal phases of the iron oxides present which were assigned to hematite, as well as Fe2+ sites located in the structure of clays minerals such as Illite and/or montmorillonite, and a Fe3+ site assigned to the structure of kaolinite.

We studied diverse minerals found in the magnetic fraction of clays from medicinal sediments collected in two Peruvian lagoons, La Milagrosa (MML) and La Mellicera (MELL). The clay fraction was separated by the sedimentation method. The analytical physical techniques we used were energy dispersive X-ray fluorescence (EDXRF), X-ray diffractometry (XRD) and transmission Mössbauer spectroscopy (TMS). We complemented them with a physical chemical analysis to determine texture, pH and electrical conductivity. We have observed, via XRD, minerals such as illite, calcite and maghemite. Specically, for MML, by XRD we observed two minerals phases: quartz and dolomite. TMS allowed us to observe the magnetic fraction of the sediments. In the spectra we observed four magnetic sextets and three paramagnetic doublets. The sextets were assigned to hematite/goethite, two sites of magnetite (Fe3+ and Fe2...