igneous
Pumice
Felsic volcanic glass
AI-generated identification · may be incorrectHardness of 6 on the Mohs scale, grayish to white color, dull luster, amorphous or glassy crystal structure, highly vesicular texture with low specific gravity allowing it to float on water.
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Physical properties
Hardness of 6 on the Mohs scale, grayish to white color, dull luster, amorphous or glassy crystal structure, highly vesicular texture with low specific gravity allowing it to float on water.
Formation & geological history
Formed during explosive volcanic eruptions when frothy lava rapidly cools and depressurizes, trapping gas bubbles within the glassy matrix.
Uses & applications
Widely used in lightweight concrete, landscaping aggregates, abrasive personal care products, and stone-washing textiles.
Geological facts
Pumice is one of the few rocks that can float on water due to its extremely high porosity and trapped gas bubbles.
Field identification & locations
Easily identified by its extremely low weight, rough abrasive texture, and abundant visible pore spaces; found near recent volcanic regions worldwide.
