The techniques described by Gall and Runnels are considered quite satisfactory for carbonate rocks containing calcite, dolomite, and ankerite (if the Fe content is known), but does not seem applicable in its present form if the minerals siderite or magnesite are present. For similar reasons the present writer, from a small-scale study of other anhydrous carbonate minerals of known chemical composition by DTA and thermogravimetric analyses, considers it likely that additional unsuitable anhydrous carbonate minerals, although relatively unimportant, are cerussite, smithsonite, rhodochrosite (because the temperature of decomposition is too low), and witherite and strontianite (because the temperature of decomposition is considerably greater than 1000 degrees C.).

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