An occurrence of maghemitic soil in association with ferroan dolomite in Minas Gerais is characterized by X-ray diffraction, magnetization measurements and M¿ssbauer spectroscopy. Altered layers on outliers of dolomite, which has composition (Ca1.04Mg0.83Fe0.11 Mn0.02)(CO3)2 indicate the weathering sequence: ferroan dolomite→calcite+poorly-crystallized ferric hydroxide→maghemite +hematite+goethite. The spontaneous magnetization of the maghemitic soil (65 wt% Fe2O3) is 8.8 JT-1kg-1; the magnetization of the soil maghemite itself is estimated to be 25¿5 JT-1kg-1, which is greatly reduced from the value for pure maghemite because of isomorphous substitution. ¿American Geophysical Union 1991