igneous
Pumice
Pumice
AI-generated identification · may be incorrectHardness: 6 on Mohs scale. Color: white, grey, yellowish, or brown. Luster: earthy to silky. Structure: highly vesicular, glassy, aphanitic texture with low specific gravity allowing it to float on water.
- Hardness
- 6 on Mohs scale
- Color
- white, grey, yellowish, or brown
- Luster
- earthy to silky
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Physical properties
Hardness: 6 on Mohs scale. Color: white, grey, yellowish, or brown. Luster: earthy to silky. Structure: highly vesicular, glassy, aphanitic texture with low specific gravity allowing it to float on water.
Formation & geological history
Formed during explosive volcanic eruptions when superheated, frothy felsic magma depressurizes and rapidly cools, trapping gas bubbles.
Uses & applications
Used widely in lightweight construction aggregates, abrasive soaps, pumice stones for personal care, and horticulture as a soil amendment.
Geological facts
Pumice is one of the few natural rocks that can float on water due to its trapped gas pore network. It has been utilized by humans for thousands of years as an abrasive tool.
Field identification & locations
Identified easily by its extremely light weight and abundance of tiny gas cavities. Found near volcanic arc regions globally, particularly around the Pacific Ring of Fire.
