igneous
Pumice
Pumice (felsic volcanic rock)
AI-generated identification · may be incorrectHardness 6 on Mohs scale; light gray to tan color; dull luster; amorphous glassy matrix with abundant vesicles; extremely low specific gravity allowing it to float on water.
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Physical properties
Hardness 6 on Mohs scale; light gray to tan color; dull luster; amorphous glassy matrix with abundant vesicles; extremely low specific gravity allowing it to float on water.
Formation & geological history
Formed from rapidly cooling, frothy, gas-rich felsic lava during explosive volcanic eruptions, typically millions of years old.
Uses & applications
Used in lightweight concrete, landscaping, abrasive personal care products, and stone-washing jeans.
Geological facts
Pumice is one of the only rocks that can float on water due to its high porosity and trapped gas bubbles.
Field identification & locations
Easily identified by its extremely lightweight feel and vesicular, sponge-like texture; found worldwide near active or historic volcanic regions.
