igneous
Pumice
Pumice (felsic volcanic rock)
AI-generated identification · may be incorrectHardness: 6 on Mohs scale. Color: white, grey, yellowish, or brown. Luster: dull to earthy. Structure: highly vesicular, frothy glass. Specific gravity: less than 1.0 (floats on water).
- Hardness
- 6 on Mohs scale
- Color
- white, grey, yellowish, or brown
- Luster
- dull to earthy
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Physical properties
Hardness: 6 on Mohs scale. Color: white, grey, yellowish, or brown. Luster: dull to earthy. Structure: highly vesicular, frothy glass. Specific gravity: less than 1.0 (floats on water).
Formation & geological history
Formed from rapidly cooling, gas-rich felsic lava during explosive volcanic eruptions. Geological age varies from recent to millions of years.
Uses & applications
Used in lightweight concrete, abrasive soaps, landscaping, horticulture, and personal care products like pumice stones for skin.
Geological facts
Pumice is one of the only rocks that can float on water due to its trapped gas bubbles. It has been used as an abrasive since ancient Roman times.
Field identification & locations
Easily identified by its extremely low weight and numerous tiny air vesicles. Found globally near active and dormant volcanic arcs.
