igneous
Pumice
Felsic volcanic rock
AI-generated identification · may be incorrectMohs hardness 6, light gray to tan color, dull luster, vesicular amorphous glass structure, specific gravity less than 1.
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Physical properties
Mohs hardness 6, light gray to tan color, dull luster, vesicular amorphous glass structure, specific gravity less than 1.
Formation & geological history
Formed from rapidly cooling, gas-rich felsic lava during explosive volcanic eruptions, trapping gas bubbles as it solidifies.
Uses & applications
Used in lightweight concrete, abrasive soaps, pumice stones for personal care, and horticulture.
Geological facts
Pumice is the only known rock that can float on water due to its high porosity and trapped air bubbles.
Field identification & locations
Easily identified in the field by its extreme lightness, numerous tiny vesicles, and ability to float.
