igneous
Pumice
Pumice (felsic volcanic rock)
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, pale gray to white color, dull luster, amorphous glassy matrix with abundant gas vesicles, specific gravity less than 1.0.
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Physical properties
Hardness of 6 on the Mohs scale, pale gray to white color, dull luster, amorphous glassy matrix with abundant gas vesicles, specific gravity less than 1.0.
Formation & geological history
Formed from explosive volcanic eruptions involving gas-rich felsic magma that cools rapidly, trapping gas bubbles.
Uses & applications
Used in lightweight concrete aggregates, abrasive stones, horticulture as a soil conditioner, and personal care cosmetics.
Geological facts
Pumice is one of the only natural rocks that can float on water due to its high porosity.
Field identification & locations
Easily identified by its extremely low density, light weight, and frothy, vesicular texture; found globally near active and ancient tectonic subduction zones.
