A light, porous volcanic rock that's so full of air holes it can actually float on water, often used for smoothing skin.
From Latin 'pumex,' possibly from Etruscan origin. The word has been used since ancient times to describe this unique volcanic stone that forms from lava with trapped gas bubbles.
Pumice stone floats so well that volcanic eruptions launch it across oceans—in 2006, a massive pumice raft from an underwater volcano drifted for thousands of miles and washed up on beaches everywhere.
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