A type of porous volcanic rock or pumice that resembles ash in color and texture, historically used as an abrasive.
Compound of ash and stone (Old English stān). The term refers to the stone's ash-like appearance and its formation through volcanic processes that create ash-colored, grainy textures.
Ashstone was essential in ancient Rome—it was used to smooth marble sculptures and polish stone buildings, so many Renaissance masterpieces literally owe their beauty to ash-colored volcanic rock!
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