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Reaction progress (α) determined from the growth and decay of the diffraction peaks for mackinawite (200), greigite (440), and pyrite (200) as a function of time at 150°C. Calculation of rates see caption Fig. 2. Error bars were omitted for clarity; mean errors in α : mackinawite (200) ± 0.0620, greigite (440) ± 0.115, pyrite (200) ± 0.0285.
