igneous
Pumice
Pumice (Vesicular Felsic Igneous Rock)
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale. Colors range from white, grey, yellowish, to brown. It has a dull, earthy luster and a highly vesicular, frothy texture.
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Physical properties
Hardness of 6 on the Mohs scale. Colors range from white, grey, yellowish, to brown. It has a dull, earthy luster and a highly vesicular, frothy texture.
Formation & geological history
Formed during explosive volcanic eruptions when gas-rich felsic lava cools rapidly, trapping gas bubbles within the rock. It is typically associated with rhyolitic and dacitic volcanism.
Uses & applications
Widely used in lightweight construction aggregates, abrasive soaps, pumice stones for personal care, and horticulture as a soil amendment.
Geological facts
Pumice is one of the only rocks that can float on water due to its high porosity and trapped air bubbles. It has been used since Roman times to create lightweight concrete.
Field identification & locations
Easily identified by its extremely low density, light weight, and visible vesicular cavities. It is commonly found around volcanic arcs and subduction zones worldwide.
