La pumita (también llamada piedra pómez o piedra pómex) es una roca magmática volcánica vítrea, con baja densidad (flota en el agua) y muy porosa, de color blanco o gris.
Pumice is a textural term for a volcanic rock that is a solidified frothy lava typically created when super-heated, highly pressurized rock is violently ejected from a volcano. It can be formed when lava and water are mixed. Pumice is commonly pale in color, ranging from white, cream, blue or grey, to green-brown or black.
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