the.com/pumice
the only rock that floats, then sands your feet smooth as an apology
floatsso full of gas bubbles it bobs on water
rock raftseruptions launch floating islands across entire oceans
frozen foamit's lava that hardened mid-fizz
ancient gritRomans scrubbed and polished with it for centuries
toothpaste dutystill sneaks into modern abrasive cleaners