igneous
Vesicular volcanic rock, likely pumice or scoria
Vesicular basaltic–rhyolitic volcanic rock; exact composition cannot be confirmed visually
AI-generated identification · may be incorrectLight tan to reddish-brown, highly vesicular, and dull to slightly glassy; likely hardness about 5–6, with no obvious cleavage and low density. The abundant cavities formed from trapped volcanic gas.
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Physical properties
Light tan to reddish-brown, highly vesicular, and dull to slightly glassy; likely hardness about 5–6, with no obvious cleavage and low density. The abundant cavities formed from trapped volcanic gas.
Formation & geological history
Formed when gas-rich lava rapidly cooled, preserving bubbles; commonly Quaternary to historic in age, though similar rocks occur throughout the Cenozoic and older volcanic record. The pale color favors pumice or weathered felsic scoria, while the reddish color may reflect iron oxidation.
Uses & applications
Used as lightweight aggregate, abrasive, landscaping stone, soil amendment, and decorative material; selected pieces may be sold as curios or specimens.
Geological facts
Pumice can sometimes float initially because its interconnected vesicles reduce bulk density; scoria is generally darker, denser, and more basaltic. Image-based identification cannot reliably distinguish pumice from scoria or weathered vesicular lava.
Field identification & locations
Test whether it feels unusually light and whether it floats; inspect a fresh edge for glassy texture and use a steel nail for hardness. Common in volcanic regions, including Italy, Iceland, the western United States, Mexico, and New Zealand.
