igneous
Pumice
Pumice (Felsic Volcanic Rock)
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, pale gray to yellowish-brown color, earthy to dull luster, amorphous volcanic glass structure, specific gravity less than 1.0.
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Physical properties
Hardness of 6 on the Mohs scale, pale gray to yellowish-brown color, earthy to dull luster, amorphous volcanic glass structure, specific gravity less than 1.0.
Formation & geological history
Formed during explosive volcanic eruptions when gas-rich felsic lava rapidly cools and depressurizes, trapping gas bubbles.
Uses & applications
Used in lightweight concrete aggregates, abrasive stones, exfoliation products, and horticultural soil conditioning.
Geological facts
Pumice is famous for being the only known rock that can float on water due to its high porosity.
Field identification & locations
Easily identified by its extremely low weight and vesicular, frothy texture; commonly found near active or ancient subduction zone volcanoes worldwide.
