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Moisture-dependent XRPD measurements of alunogen recorded at 25 °C in the RH range a between 0 and 80 % (sorption) and b between 80 and 0 % (desorption). Hysteresis between the transformations from meta-alunogen to alunogen (at about 40 % RH, sorption) and from alunogen to meta-alunogen (at about 20 % RH, desorption) is clearly visible
