The several reported variations in DTA curves of siderite are reproduced from samples of the same siderite by varying the particle size, dilution, and tightness of packing. The relationship between these variables and the suppression of the endothermic loop associated with the loss of CO2 is shown by a set of curves. By controlling the ambient furnace atmosphere, with a cover over the sample or with an inert gas, the exothermic loops accompanying the oxidation of the iron oxide resulting from decomposition of the FeCO3 can be delayed or completely suppressed. The results of x-ray diffraction studies of samples heated to several different temperatures are used in interpreting the DTA curves.

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