igneous
Pumice
Pumice (felsic volcanic rock)
AI-generated identification · may be incorrectHardness 6 on Mohs scale, colors range from white to gray or yellowish, dull to earthy luster, amorphous volcanic glass with frothy vesicular texture, specific gravity less than 1.0 (floats on water).
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Physical properties
Hardness 6 on Mohs scale, colors range from white to gray or yellowish, dull to earthy luster, amorphous volcanic glass with frothy vesicular texture, specific gravity less than 1.0 (floats on water).
Formation & geological history
Formed through the rapid solidification of frothy, gas-rich felsic lava during explosive volcanic eruptions, typically dating from various recent to ancient geological periods.
Uses & applications
Widely used in lightweight construction aggregates, abrasive soaps, cosmetic exfoliating products, and horticulture as a soil amendment.
Geological facts
Pumice is the only known rock that can float on water due to its high concentration of trapped gas bubbles formed during volcanic cooling.
Field identification & locations
Easily identifiable in the field by its extremely light weight, pale color, and abundant visible gas cavities; commonly found in regions with past explosive silicic volcanism.
