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Muscovites from pegmatite bodies from southwestern Nigeria have been characterized by PIXE. The chemical analysis reveals that in these muscovites, the interlayer sites are occupied mainly by K, Fe, Rb Na, and traces of Mg and Ca in the octahedral positions whilst Si, Al, Ti Mn occur in the tetrahedral ones. The low Na/(Na+ K) ratios, low Ti content and enrichment in Rb in the muscovite suggest postmagmatic genesis of the host rocks. The variability in trace element composition may reflect differences in geological environment of emplacement of the pegmatite bodies. [ABSTRACT FROM AUTHOR]