igneous
Pumice
Pumice (Vesicular Felsic Igneous Rock)
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, pale gray to cream color, dull luster, amorphous glassy structure, extremely low specific gravity allowing it to float on water.
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Physical properties
Hardness of 6 on the Mohs scale, pale gray to cream color, dull luster, amorphous glassy structure, extremely low specific gravity allowing it to float on water.
Formation & geological history
Formed from rapidly cooling, gas-rich felsic lava during explosive volcanic eruptions, trapping gas bubbles within the glassy matrix.
Uses & applications
Used in lightweight concrete, abrasive personal care products, stone-washing textiles, and horticulture.
Geological facts
Pumice is one of the only rocks that can float on water due to its high porosity. It is chemically similar to obsidian.
Field identification & locations
Easily identified by its distinctive vesicular texture, light weight, and pale color; commonly found near active or ancient volcanic regions.
