igneous
Pumice
Felsic volcanic rock
AI-generated identification · may be incorrectHardness of 6 on Mohs scale, colors range from white to grey or yellowish, vitreous to dull luster, vesicular and amorphous crystal structure with low specific gravity allowing it to float.
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Physical properties
Hardness of 6 on Mohs scale, colors range from white to grey or yellowish, vitreous to dull luster, vesicular and amorphous crystal structure with low specific gravity allowing it to float.
Formation & geological history
Formed during explosive volcanic eruptions when gas-rich felsic lava cools rapidly, trapping gas bubbles within the glassy rock matrix.
Uses & applications
Widely used in abrasive products, lightweight construction aggregates, concrete additives, and personal care items like exfoliating stones.
Geological facts
Pumice is one of the few rocks that can float on water due to its high porosity and trapped air bubbles.
Field identification & locations
Easily identified by its extremely low density, light weight, and abundance of small gas cavities; found worldwide near regions of recent volcanic activity.
