igneous
Pumice
Pumice (Vesicular Felsic Igneous Rock)
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, pale gray to tan color, dull luster, amorphous glass structure, specific gravity less than 1 due to high porosity.
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Physical properties
Hardness of 6 on the Mohs scale, pale gray to tan color, dull luster, amorphous glass structure, specific gravity less than 1 due to high porosity.
Formation & geological history
Formed from rapidly cooling, gas-rich felsic lava during explosive volcanic eruptions, creating a frothy glass texture.
Uses & applications
Used in lightweight concrete aggregates, abrasive personal care products, stone-washing denim, and horticultural soil amendments.
Geological facts
Pumice is one of the only rocks that can float on water due to its trapped gas bubbles forming a network of interconnected vesicles.
Field identification & locations
Identified by its extremely light weight, abrasive texture, and visible gas vesicles; found globally near active and ancient volcanic arcs.
