igneous
Pumice
Pumice
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, grayish to white color, vitreous to dull luster, vesicular amorphous glass texture, and exceptionally low specific gravity allowing it to float on water.
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Physical properties
Hardness of 6 on the Mohs scale, grayish to white color, vitreous to dull luster, vesicular amorphous glass texture, and exceptionally low specific gravity allowing it to float on water.
Formation & geological history
Formed during explosive volcanic eruptions when gas-rich felsic lava cools rapidly, trapping gas bubbles within the glassy matrix.
Uses & applications
Used widely in lightweight construction aggregates, abrasive personal care products, stone-washing textiles, and horticulture.
Geological facts
Pumice is the only rock that can float on water due to its high concentration of trapped gas bubbles. It has been used as an abrasive since ancient Roman times.
Field identification & locations
Easily identified by its extremely light weight and porous, frothy texture filled with tiny holes. Commonly found near convergent plate boundaries and volcanic regions worldwide.
