igneous
Pumice
Pumice (Vesicular Felsic Igneous Rock)
AI-generated identification · may be incorrectMohs hardness of 5.5 to 6, pale gray to white color, vitreous to dull luster, amorphous glass structure with high vesicularity, specific gravity less than 1.0 (floats on water).
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Physical properties
Mohs hardness of 5.5 to 6, pale gray to white color, vitreous to dull luster, amorphous glass structure with high vesicularity, specific gravity less than 1.0 (floats on water).
Formation & geological history
Formed from rapidly cooling, gas-rich felsic lava during explosive volcanic eruptions, typically ranging from recent to millions of years old.
Uses & applications
Used widely in abrasive materials, lightweight concrete, horticulture as soil amendment, and personal care products like pumice stones.
Geological facts
Pumice is one of the only rocks that can float on water due to its trapped gas bubbles and extremely high porosity.
Field identification & locations
Easily identified in the field by its very light weight, pale coloration, and abundant gas bubble cavities (vesicles). Commonly found near explosive volcanic arcs globally.
