igneous
Pumice
Pumice (volcanic glass foam)
AI-generated identification · may be incorrectHardness: 6 on Mohs scale. Color: white, grey, yellowish, or brown. Luster: dull to earthy. Structure: amorphous, highly vesicular with trapped gas bubbles, extremely low density.
- 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: amorphous, highly vesicular with trapped gas bubbles, extremely low density.
Formation & geological history
Formed during explosive volcanic eruptions when frothy, gas-rich felsic lava cools and solidifies rapidly, preventing crystal formation.
Uses & applications
Used in lightweight construction aggregates, abrasive soaps, cosmetic exfoliating stones, and horticulture soil amendments.
Geological facts
Pumice is one of the few natural rocks that can float on water due to its high porosity and trapped air chambers.
Field identification & locations
Easily identified by its extremely light weight and abundant visible pores; found globally near active and ancient volcanic arcs.
