A series of experiments on the stability of goethite (α-FeO · OH) shows that it decomposes to hematite (α-Fe2O3) in neutral solutions above 125 ± 15° C. and in alkaline solutions above 165° ± 5° C. at a pressure near the vapour pressure of the solutions. Increase of pressure raises the decomposition temperature of goethite less than 5° C. per 1000 atmospheres, up to 2000 atmospheres. The possible use of the pressure insensitive pair, hematite-goethite, in geothermometry is discussed.

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