Pumice or Scoria

Pumice is a highly vesicular rock that can float on water. It was formed when bubbly lava erupted by a volcano cooled down rapidly but did not crystallize. The density of pumice is as low as 0.3-0.4 g/cm³ because of amount of vesicles. It usually refers to light-colored vesicular acidic glassy volcanic rocks, formed by bubbly andesitic, dacitic and rhyolitic lavas. But here the dark-colored basaltic vesicular rock fragments belong to a sort of scoria which is different from the white silicic pumice.
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