igneous
Pumice
Pumice (felsic volcanic glass)
AI-generated identification · may be incorrectHardness 6 on Mohs scale, colors range from white to gray and yellowish-brown, dull luster, highly vesicular amorphous structure, specific gravity less than 1.0 allowing it to float.
Identified More igneous →
Explore Pumice in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness 6 on Mohs scale, colors range from white to gray and yellowish-brown, dull luster, highly vesicular amorphous structure, specific gravity less than 1.0 allowing it to float.
Formation & geological history
Formed through rapid cooling and depressurization of gas-rich felsic lava during explosive volcanic eruptions.
Uses & applications
Used in lightweight concrete, concrete additives, abrasives, personal care exfoliating products, and horticulture.
Geological facts
Pumice is one of the only rocks that can float on water due to its trapped gas bubbles and extremely high porosity.
Field identification & locations
Easily identified by its extremely low weight, pale color, and abundant vesicular holes; found worldwide near modern and ancient volcanic arcs.
