igneous
Pumice
Volcanic glass foam
AI-generated identification · may be incorrectHardness 6 on Mohs scale, white to gray or yellowish color, vitreous to dull luster, amorphous volcanic glass structure with frothy vesicular texture, specific gravity less than 1.0.
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Physical properties
Hardness 6 on Mohs scale, white to gray or yellowish color, vitreous to dull luster, amorphous volcanic glass structure with frothy vesicular texture, specific gravity less than 1.0.
Formation & geological history
Formed from rapidly cooling, gas-rich felsic lava during explosive volcanic eruptions, trapping gas bubbles within the solidifying glass.
Uses & applications
Used in abrasive materials, lightweight concrete aggregate, horticulture as a soil amendment, and personal care products like pumice stones.
Geological facts
Pumice is one of the few geological specimens with a specific gravity low enough to float on water.
Field identification & locations
Easily identified by its extremely low weight and high porosity filled with tiny gas bubbles; found globally near active and ancient volcanic arcs.
