igneous
Pumice
Pumice
AI-generated identification · may be incorrectMohs hardness of 6.0, white to light gray or tan color, dull to earthy luster, amorphous volcanic glass structure, specific gravity less than 1.0 allowing it to float on water.
Identified More igneous →
Explore Pumice in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Mohs hardness of 6.0, white to light gray or tan color, dull to earthy luster, amorphous volcanic glass structure, specific gravity less than 1.0 allowing it to float on water.
Formation & geological history
Formed from rapidly cooling, frothy felsic lava ejected during explosive volcanic eruptions, trapping gas bubbles as it solidifies.
Uses & applications
Used widely in lightweight construction aggregates, abrasive stones, horticulture, and personal care products like pumice stones for skin exfoliation.
Geological facts
Pumice is one of the only natural rocks that can float on water due to its high porosity and trapped gas bubbles.
Field identification & locations
Easily identified by its extremely low density, light weight, vesicular texture with numerous small pores, and pale coloration; found globally near active and extinct volcanic regions.
