Studies on the Hydrated Iron Oxides. IV : Iron Oxide Minerals Altered from Magnetite by Weathering

The alteration process of natural oxidation of magnetite from the capping of magnetite deposits at Takanokura Mine, Fukushima Prefecture may be induced as follows : chemical formula The natural oxidation of magnetite from all other deposits in Japan may be taken to have followed some part of the above formula. In this report, the mineralogical properties of some minerals altered from magnetite, namely, hydrous magnetite, maghemite and goethite, are also described