igneous
Pumice
Pumice (felsic volcanic rock)
AI-generated identification · may be incorrectHardness 6 on Mohs scale, color ranges from white to grey or yellowish, dull luster, vesicular and frothy crystal structure, specific gravity less than 1.0 allowing it to float.
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Physical properties
Hardness 6 on Mohs scale, color ranges from white to grey or yellowish, dull luster, vesicular and frothy crystal structure, specific gravity less than 1.0 allowing it to float.
Formation & geological history
Formed from rapidly cooling gas-rich felsic to intermediate volcanic lava, often during explosive volcanic eruptions.
Uses & applications
Used in lightweight concrete, landscaping, abrasive personal care products, and stone-washing jeans.
Geological facts
Pumice is one of the only rocks that can float on water due to its trapped gas bubbles forming a network of micro-vesicles.
Field identification & locations
Identify by its extremely lightweight feel, pale color, and numerous visible gas cavities; found worldwide near modern and ancient volcanic arcs.
