igneous
Pumice
Pumice (Extrusive Igneous Rock)
AI-generated identification · may be incorrectHardness of 5.5 to 6 on the Mohs scale, typically light gray to white or yellowish, dull to earthy luster, extremely vesicular and frothy texture.
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Physical properties
Hardness of 5.5 to 6 on the Mohs scale, typically light gray to white or yellowish, dull to earthy luster, extremely vesicular and frothy texture.
Formation & geological history
Formed from rapidly cooling, gas-rich felsic lava during explosive volcanic eruptions, creating trapped gas bubbles that leave a porous framework.
Uses & applications
Commonly used in lightweight concrete, abrasive products, landscaping, personal care exfoliants, and horticulture.
Geological facts
Pumice is one of the few natural rocks that can float on water due to its exceptionally 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 volcanic regions.
