igneous
Pumice
Pumice (Vesicular Felsic Volcanic Rock)
AI-generated identification · may be incorrectHardness of 6 on Mohs scale, pale gray to white color, dull luster, amorphous glass with abundant gas cavities, specific gravity less than 1.0.
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Physical properties
Hardness of 6 on Mohs scale, pale gray to white color, dull luster, amorphous glass with abundant gas cavities, specific gravity less than 1.0.
Formation & geological history
Formed from rapidly cooling, frothy felsic lava ejected during explosive volcanic eruptions, trapping gas bubbles.
Uses & applications
Used widely in lightweight concrete, landscaping, abrasive personal care products, and stone-washing jeans.
Geological facts
Pumice is one of the only natural rocks that can float on water due to its high porosity and trapped air chambers.
Field identification & locations
Identified by its extremely light weight and vesicular, sponge-like texture; commonly found near active or ancient volcanic regions.
