igneous
Weathered vesicular stone, possibly pumice or scoria
Vesicular volcanic rock; likely pumice (highly vesicular rhyolitic material) or scoria (basaltic material)
AI-generated identification · may be incorrectPale gray-green, porous, and irregularly rounded with a dull to slightly earthy luster; likely hardness about 5–6 Mohs, with abundant gas cavities and no obvious cleavage. The photograph is insufficient to distinguish pumice from scoria confidently.
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Physical properties
Pale gray-green, porous, and irregularly rounded with a dull to slightly earthy luster; likely hardness about 5–6 Mohs, with abundant gas cavities and no obvious cleavage. The photograph is insufficient to distinguish pumice from scoria confidently.
Formation & geological history
Formed when gas-rich volcanic lava rapidly cooled, trapping bubbles; its exact geological age and volcanic source cannot be determined visually. Such rocks commonly form in lava flows, domes, and explosive eruption deposits.
Uses & applications
Pumice is used as an abrasive, lightweight aggregate, horticultural medium, and concrete additive; scoria is used in landscaping, drainage, road base, and lightweight construction.
Geological facts
Low density and abundant vesicles are diagnostic of gas-rich volcanic material; pumice may float initially, whereas denser scoria generally sinks.
Field identification & locations
Test whether it is unusually light, porous, and scratchable with a steel nail; pumice is typically pale and glassy, while scoria is darker and denser. Common sources include volcanic regions worldwide, including the western United States, Iceland, Italy, and New Zealand.
