igneous
Pumice
Pumice (felsic volcanic rock)
AI-generated identification · may be incorrectHardness 6 on Mohs scale, white to gray color, dull to earthy luster, vesicular amorphous glass structure, specific gravity less than 1.
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Physical properties
Hardness 6 on Mohs scale, white to gray color, dull to earthy luster, vesicular amorphous glass structure, specific gravity less than 1.
Formation & geological history
Formed during explosive volcanic eruptions when frothy felsic lava rapidly cools and depressurizes, trapping gas bubbles.
Uses & applications
Used in lightweight concrete, abrasives, cosmetics, horticultural soil amendment, and stonewashing denim.
Geological facts
Pumice is the only rock known to float on water due to its high porosity and trapped air bubbles.
Field identification & locations
Easily identified by its extremely low weight and porous, sponge-like texture; found near young volcanic regions worldwide.
