igneous
Pumice
Pumice
AI-generated identification · may be incorrectHardness 6 on Mohs scale, colors range from white to gray and brown, dull luster, amorphous glassy texture with abundant vesicular cavities, low specific gravity causing it to float on water.
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Physical properties
Hardness 6 on Mohs scale, colors range from white to gray and brown, dull luster, amorphous glassy texture with abundant vesicular cavities, low specific gravity causing it to float on water.
Formation & geological history
Formed during explosive volcanic eruptions when frothy, gas-rich dacitic or rhyolitic lava rapidly cools and depressurizes, trapping gas bubbles.
Uses & applications
Used in lightweight concrete aggregates, abrasive blocks, exfoliating stones in cosmetics, and stone-washing denim.
Geological facts
Pumice is one of the few rocks that can float on water due to its extremely high porosity and trapped air bubbles.
Field identification & locations
Easily identified by its extremely light weight, vesicular texture filled with tiny holes, and ability to float.
