igneous
Pumice (likely basaltic pumice/scoria)
Vesicular volcanic rock, commonly basaltic; mainly plagioclase, pyroxene, and volcanic glass
AI-generated identification · may be incorrectPinkish-red, fine-grained and highly vesicular, with a dull earthy surface and dark volcanic inclusions. Very low density and apparent light weight strongly support pumice; hardness about 5–6, with irregular fracture and no cleavage.
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Physical properties
Pinkish-red, fine-grained and highly vesicular, with a dull earthy surface and dark volcanic inclusions. Very low density and apparent light weight strongly support pumice; hardness about 5–6, with irregular fracture and no cleavage.
Formation & geological history
Forms when gas-rich lava erupts and rapidly cools, trapping abundant bubbles. It may be young Quaternary volcanic material; the pink color can result from oxidation or alteration. Exact age cannot be determined visually.
Uses & applications
Used as lightweight aggregate, abrasive, horticultural soil additive, and occasionally as a decorative or carving stone; generally low collector value.
Geological facts
Pumice can float when its connected pore spaces contain air, although weathered or dense pieces may sink. The specimen appears more compact and reddish than typical pale pumice, so scoriaceous volcanic rock is also possible.
Field identification & locations
Commonly associated with volcanic terrains around Guerrero, Mexico, including basaltic volcanic fields. Field tests: unusually light for its size, porous, rough, and may scratch glass only weakly; a fresh broken surface should reveal vesicles. It is not likely meteorite or slag based on texture.
