igneous
Pumice (likely)
Vesicular volcanic rock, typically rhyolitic to dacitic glass with minor feldspar and other minerals
AI-generated identification · may be incorrectPale gray-beige, porous and rough with abundant small cavities; usually Mohs 5–6, dull to slightly glassy, with no distinct cleavage. The image alone cannot confirm composition or whether it is pumice rather than another vesicular rock.
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Physical properties
Pale gray-beige, porous and rough with abundant small cavities; usually Mohs 5–6, dull to slightly glassy, with no distinct cleavage. The image alone cannot confirm composition or whether it is pumice rather than another vesicular rock.
Formation & geological history
Forms when gas-rich volcanic lava cools rapidly, trapping bubbles in solidified glass; generally associated with relatively young explosive eruptions, though the specimen’s age is unknown.
Uses & applications
Used as an abrasive, lightweight aggregate, horticultural soil additive, and in polishing products; attractive pieces are collected, but this example appears common.
Geological facts
Pumice can be so vesicular that it floats in water, though denser varieties sink.
Field identification & locations
Look for a very lightweight, porous texture and abundant connected or rounded vesicles; it occurs around volcanic regions worldwide. A small common specimen typically sells for about $1–$10 USD.
