igneous
Pumice
Pumice (volcanic glass foam)
AI-generated identification · may be incorrectHardness 6 on Mohs scale, colors range from white to gray or tan, vesicular and glassy luster with extremely low density that allows it to float on water.
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Physical properties
Hardness 6 on Mohs scale, colors range from white to gray or tan, vesicular and glassy luster with extremely low density that allows it to float on water.
Formation & geological history
Formed during explosive volcanic eruptions when frothy, gas-rich lava rapidly cools and depressurizes, trapping gas bubbles.
Uses & applications
Used widely in lightweight concrete, abrasive soaps, pumice stones for personal care, and horticulture as a soil conditioner.
Geological facts
Pumice is one of the few rocks that can float on water due to its high concentration of gas-filled vesicles.
Field identification & locations
Easily identified by its extremely light weight, vesicular texture, and pale color; commonly found in regions with recent explosive volcanic activity.
