Abstract
The Chemical Remanent Magnetization (CRM) produced by dehydrating the four isomers of ferric oxyhydroxide has been investigated using X-ray and thermoanalytical as well as thermomagnetic techniques. Synthetic powders were used set in a plaster of Paris matrix and the CRM acquired after heating in the Earth's field was measured using an astatic magnetometer. The CRM of an artificial chalybeate sandstone was also studied. The nature of the resultant CRM was dependent on the parent oxyhydroxide and the remanence of very fine hematite particles was unexpectedly large in view of previous work on the magnetic stability of such fine grains. The reversal of the remanence in the case of γ-FeOOH was particularly striking and could be of some paleomagnetic importance. The CRM carried by α-Fe 2O 3 derived from FeOOH was seen not only to reflect the crystal structure of the parent material but also the temperature to which the oxide had been heated.
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