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Goethite on heating in air, undergoes both oxidation and dehydration. X-ray investigations of the heat-treated samples of goethite at different temperatures indicate hydrogoethite, maghemite (hydro?) and hydrohematite as intermediate products prior to the conversion into hematite. This paper summarizes the various possible stages of transformation, on heating in air, of goethite due to oxidation and dehydration, and a correlation has been made with the differential thermal studies of goethite.
This record provided courtesy of AGI/GeoRef.
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