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Particle‐induced x‐ray emission (PIXE) and Rutherford backscattering spectromatery (RBS) were used to analyse desert rose geological samples. Samples from the rose core and from the rose peripherals were studied. All samples were found to contain C, N, O, Na, Mg, Si, S, Cl, K, Ca, Ti, Mn, Fe and Sr. Core samples were found to contain more silicon than peripheral samples. The extra silicon in the rose core may suggest a mechanism for the formation of the rose through crystal growth on a seed of silicon.

Human kidney stones were analysed by particle‐induced x‐ray emission (PIXE) and Rutherford backscattering spectrometric (RBS) techniques using a 2 MeV He2+ beam. The stones were found to contain C, N, O, F, Na, Mg, Si, P, S, Cl, K, Ca, Fe and Br. The results obtained by PIXE agreed with those obtained by RBS within experimental error. A mechanism for the formation of the kidney stones is suggested.