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we examined the effect of the starting particle size on the formation of the glass. the effect is more pronounced for larger particles, which means that the formation of glass is more affected by the particle size than by the temperature and the duration of heating. samples with larger starting particle size are more likely to yield quartz in the glass. with increasing starting particle size, the amount of quartz in the glass is always higher. a lower amount of quartz in the glass is observed for samples with lower starting particle size, which means that the formation of the quartz is less affected by the starting particle size. these results suggest that the starting particle size is an important variable affecting the glass formation as well as the phase content. this result is important to be considered when interpreting the source rocks of vitrified hillfort. since the starting particle size in the geological history of the rocks is highly variable, the starting particle size should be taken into account when interpreting the glass obtained from archaeological samples.
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our work presents a range of experimental conditions that may have been utilized to melt the walls of broborg hillfort. the experimental conditions used were quite extreme and differed from those in the literature on vitrified hillforts, but our work may provide information on the chemistry and possible preservation conditions of other vitrified hillforts.
clay-rich rocks like granite are commonly regarded as the source rock for vitrification, based on the lack of apparent feldspar in many vitrified hillforts. however, in our experiments, we were not able to reproduce feldspar, but instead obtained amphibolites. amphibolites are feldspathoid-rich rocks in which mafic minerals like pyroxene and olivine are common. several amphibolite rocks at the broberg site have been reported and are also present in the vase-shaped depressions in the vitrified wall. this is consistent with our results and suggests that the source rock for the vitrification was amphibolite, possibly mixed with granite.