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This work presents a study of structure and the magnetic behavior of magnetic nanoparticles (MNPs) extraction process from natural materials: iron sand. The process of extracting and synthesizing Fe3O4 from iron sand was carried out using the co-precipitation method; with the stages of formation of 2 FeCl3(l) and FeCl2(s) compounds, then proceed with the formation of Fe3O4(s) deposits. Magnetic analysis of MNPs, using VSM, structure analysis using XRD, FTIR and HRPD, and morphology using TEM. MNPs have a magnetite structure (Fe3O4) referring to the results of diffraction analysis (XRD) and FTIR, characterized by the presence of Fe-O functional groups; MNPs Fe3O4 are also superparamagnetic, based on the H-Hysterical curve profile. The particle size of MNPs Fe3O4 belongs to the category of nanoparticles (diameter size 15-20 nm), assuming the shape of particles is spherical, which tends to form agglomerated formations.