igneous
Pumice
Pumice (felsic volcanic rock)
AI-generated identification · may be incorrectHardness of 6 on Mohs scale, pale gray to white color, vitreous luster, amorphous glassy crystal structure, very low specific gravity allowing it to float on water.
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Physical properties
Hardness of 6 on Mohs scale, pale gray to white color, vitreous luster, amorphous glassy crystal structure, very low specific gravity allowing it to float on water.
Formation & geological history
Formed from rapidly cooling, highly gas-saturated felsic lava during explosive volcanic eruptions.
Uses & applications
Used in lightweight concrete aggregates, abrasive stones, cosmetics, and horticultural soil conditioning.
Geological facts
Pumice is unique among igneous rocks for its ability to float on water due to its high vesicular porosity.
Field identification & locations
Identify by its extremely light weight and frothy, sponge-like texture filled with tiny gas bubbles; found globally near young volcanic regions.
