pumice

This term describes a specific volcanic glass characterized by a frothy, vesicular texture. It is primarily recognized for its abrasive properties, making it a staple in skincare and industrial polishing. The word evokes a tactile sensation of roughness and grit, specifically used for exfoliating dead skin or smoothing coarse materials. As a noun, it is typically treated as an uncountable mass noun when referring to the material in general. To specify a single unit, users must employ partitive constructions such as a piece of pumice or a pumice stone.