igneous
Pumice
Pumice (felsic volcanic rock)
AI-generated identification · may be incorrectHardness 6 on Mohs scale, pale grey to white color, dull or earthy luster, highly vesicular amorphous volcanic glass structure, specific gravity less than 1.0.
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Physical properties
Hardness 6 on Mohs scale, pale grey to white color, dull or earthy luster, highly vesicular amorphous volcanic glass structure, specific gravity less than 1.0.
Formation & geological history
Formed during explosive volcanic eruptions when frothy felsic lava rapidly cools and depressurizes, trapping gas bubbles.
Uses & applications
Used in lightweight construction aggregates, abrasive soaps, pumice stones for personal care, and horticulture.
Geological facts
Pumice is the only known rock that can float on water due to its trapped gas bubbles and extremely low density.
Field identification & locations
Easily identified by its extremely low weight, pale color, and abundant small holes or vesicles. Found worldwide near active or ancient volcanic regions.
