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The compositional evolution of the Hekla magma system is roughly a linear function of the length of the repose periods between eruptions. Thus the silica and alkali content of the initial product of each eruption increases with the length of the preceding repose. Also, the longer the repose the greater the force of the initial outbreak and the volume of the products. After the initial explosive outbreak there follows a less violent eruption of lavas which can last for many months. The composition of the products changes from the initial silicic towards an intermediate icelandite (54-55% SiO2) at the end of the eruption.