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My bad.. I think it's more pentagonal 
Sorry.. But what is a Basalt Flow?
Pompeii was a Plinian eruption (named after Pliny the Elder, who described the eruption of Vesuvius that buried Pompeii), which is a very different type of volcanic eruption than the basalt flows of the Giant's Causeway. Plinian eruptions (Vesuvius, Mt. St. Helens, Krakatoa) are explosive volcanoes that are closer to the rhyolite (silicic) end member of volcanic material. These erupt high into the stratosphere with abundant ash and tephra falling from the sky. The ash and tephra are what buried Pompeii, not a lava flow like those seen on Hawaii.