igneous
Pumice
Pumice (felsic volcanic rock)
AI-generated identification · may be incorrectHardness 6 on Mohs scale, grayish to white color, dull luster, vesicular/frothy amorphous glass structure, specific gravity less than 1.0 (floats on water).
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Physical properties
Hardness 6 on Mohs scale, grayish to white color, dull luster, vesicular/frothy amorphous glass structure, specific gravity less than 1.0 (floats on water).
Formation & geological history
Formed from explosive volcanic eruptions where gas-rich felsic lava rapidly cools and depressurizes, trapping gas bubbles.
Uses & applications
Used in lightweight concrete, abrasive personal care products like pumice stones, horticulture, and specialized industrial polishing.
Geological facts
Pumice is one of the only rocks that can float on water due to its high porosity from trapped volcanic gases.
Field identification & locations
Easily identified by its extremely low weight, pale color, and abundant bubble cavities; found globally near active tectonic zones and volcanic arcs.
