The rock used for Stonehenge and other Neolithic sites is sarsen which is a rock that when cleaved shows an inner core of blue, especially when wet. There are also flecks within this blue core of feldspar. It is theorized that this may be why the ancient people who built Neolithic monuments like Stonehenge used sarsen, as it may have been seen to have magical properties being that it’s interior is so unique. Evidence of being able to sand down rock now exists because of the Knowth Macehead which...
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