igneous
Pumice
Felsic volcanic glass
AI-generated identification · may be incorrectHardness of 5.5 to 6, white to grey color, dull luster, amorphous glassy structure, and distinct vesicular texture with extreme porosity.
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Physical properties
Hardness of 5.5 to 6, white to grey color, dull luster, amorphous glassy structure, and distinct vesicular texture with extreme porosity.
Formation & geological history
Formed from rapidly cooling, gas-rich felsic lava during explosive volcanic eruptions, preventing crystal growth and trapping gas bubbles.
Uses & applications
Used extensively in lightweight construction aggregates, abrasive soaps, cosmetic exfoliants, and horticulture for soil aeration.
Geological facts
Pumice is one of the only known igneous rocks that can float on water due to its trapped gas cavities.
Field identification & locations
Easily identified in the field by its very light weight and prominent vesicular, sponge-like holes; commonly found near convergent plate boundaries and volcanic regions worldwide.
