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Bluestone is a name given to a form of dolerite which appears blue when wet or freshly broken.
The bluestones at Stonehenge were placed there during the third phase of construction at Stonehenge around 2600 BC. There are about 80 of them and they weigh about 4 tons each. They are believed to have been brought from the Preseli Hills, about 250 miles away in Wales.
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