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Stonehenge's Bluestones

4 min read

Among the enduring mysteries of prehistoric architecture, Stonehenge stands as a monumental testament to ancient human ingenuity. While the massive, locally sourced sarsen stones dominate the popular imagination, it is the smaller, non-local monoliths known as bluestones that present one of the most compelling archaeological puzzles in Europe. Forty-three of these pillars — averaging between two and five tons each — form the monument’s inner horseshoe and circle. “Bluestone” is not a geological term but a collective designation for several rock types, most notably spotted dolerite (distinguished by white flecks embedded in dark igneous rock), rhyolite, and volcanic tuff. The name comes from the vivid blue-grey hue these stones reveal when wet or freshly fractured.

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