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The kinetics of Fe 2+ -Mg exchange between the M1 and M2 sites (Fe M2  2+  + Mg M1  = Fe 2+  M1  + Mg M2 ) were followed by ordering experiments in an augitic clinopyroxene (Ca 0.841 Na 0.019 Mg 0.888 Fe 2+  0.151  Ti 0.011 Al 0.028 Cr 0.003 Fe 3+  0.054 Mn 0.006 )(Si 1.914 Al 0.086 ) from a dike on Alicudi (Aeolian Islands, Italy). The same single crystal was annealed in silica tubes in an iron-wüstite buffered Ar atmosphere, at 700, 750, 800, 850, and 950 °C, followed by quenching after each thermal treatment, and was used for the collection of X-ray diffraction data and for microprobe analysis.

Ordering kinetics of Mg-Fe 2+ exchange in a Wo 43 En 46 Fs 11 augite