igneous
Pumice
Pumice (Vesicular Felsic Igneous Rock)
AI-generated identification · may be incorrectHardness 6 on Mohs scale, colors range from white to gray and yellowish, dull to earthy luster, amorphous glassy texture with high vesicular porosity allowing it to float on water, specific gravity less than 1.
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Physical properties
Hardness 6 on Mohs scale, colors range from white to gray and yellowish, dull to earthy luster, amorphous glassy texture with high vesicular porosity allowing it to float on water, specific gravity less than 1.
Formation & geological history
Formed during explosive volcanic eruptions of felsic lava supersaturated with gas, which rapidly cools and depressurizes to trap gas bubbles as vesicles.
Uses & applications
Used widely in abrasive materials, lightweight concrete aggregates, cosmetic exfoliating products, and horticultural soil conditioning.
Geological facts
Pumice is one of the only geological specimens that can float on water due to its trapped gas bubbles. It has been used since antiquity for personal hygiene and construction.
Field identification & locations
Easily identified by its extremely low density, light weight, and visible vesicular cavities. Commonly found in regions with active or historic volcanic arcs and explosive felsic volcanism.
