igneous
Pumice
Pumice (felsic volcanic rock)
AI-generated identification · may be incorrectMohs hardness of 6, white to grey or yellowish color, dull to earthy luster, amorphous glass foam structure with abundant gas vesicles, specific gravity less than 1.0 allowing it to float on water.
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Physical properties
Mohs hardness of 6, white to grey or yellowish color, dull to earthy luster, amorphous glass foam structure with abundant gas vesicles, specific gravity less than 1.0 allowing it to float on water.
Formation & geological history
Formed during explosive volcanic eruptions when rapidly cooling frothy felsic lava traps gas bubbles, dating from recent to ancient geological eras.
Uses & applications
Used widely in lightweight construction aggregates, abrasive soaps, pumice stones for personal care, and horticulture.
Geological facts
It is one of the only natural rocks that can float on water due to its extremely high porosity and trapped gas bubbles.
Field identification & locations
Easily identified by its extremely low density, light weight, and abundance of small vesicular holes; commonly found near convergent plate boundaries and volcanic regions.
