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An assessment of results obtained from Mössbauer spectra of lunar samples

Most of the minerals on the Moon’s surface contain iron as a major constituent, and this enables them to be examined by Mossbauer spectroscopy. The advantages and limitations of this technique for examining lunar samples will be briefly mentioned, before reviewing the results so far obtained on material returned by the Apollo and Luna missions. By far the greatest proportion of iron is present as Fe(II) or Fe(0), and no appreciable concentration of Fe(III) has been observed. The relative amounts of iron-containing minerals at the various lunar sites have been determined and related to the lunar geological features. The more detailed determination of the distribution of iron between the M1 and M2 sites in pyroxene minerals leads to information on the thermal history of the rocks. Likewise the presence of superparamagnetic iron particles within the surface layers of some of the soil particles provides significant evidence concerning their origin and subsequent history.