igneous
Pumice
Pumice
AI-generated identification · may be incorrectHighly vesicular, rough texture, light-colored (often white, grey, or pale red/pink), very low specific gravity (often floats on water). Hardness is typically around 5.5 to 6 on the Mohs scale, though it feels softer due to its porous nature.
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Physical properties
Highly vesicular, rough texture, light-colored (often white, grey, or pale red/pink), very low specific gravity (often floats on water). Hardness is typically around 5.5 to 6 on the Mohs scale, though it feels softer due to its porous nature.
Formation & geological history
Formed during explosive volcanic eruptions when highly pressurized, super-heated rock is violently ejected from a volcano. The frothy configuration is frozen in place as the material cools rapidly.
Uses & applications
Used as an abrasive in cleaning, cosmetics (pumice stones), polishes, and pencil erasers. Also used in lightweight concrete, landscaping, and horticulture to improve soil drainage.
Geological facts
Because of its highly vesicular structure, pumice can float on water, sometimes forming large pumice rafts after oceanic volcanic eruptions.
Field identification & locations
Easily identified by its extremely light weight and highly porous, frothy texture. It is found in volcanic regions worldwide.
