Pumice
Also known as: pumice stone
Pumice, called pumicite in its powdered or dust form, is a volcanic rock that consists of extremely vesicular rough-textured volcanic glass, which may or may not contain crystals.
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Pumice: Ercolano
Unlike neighboring Pompeii, which was buried under pumice and fine ash, the citizens of Herculaneum died of severe thermal shock from successions of superheated pyroclastic surges and lava flows.
Pumice: Pompeii’s Last Hours
Vesuvius violently ejected a cloud of super-heated tephra and gases to a height of 33 km (21 mi), ejecting molten rock, pulverized pumice and hot ash at 1.5 million tons per second, ultimately releasing 100,000 times the thermal energy of the atomic bombings of Hiroshima and Nagasaki.