igneous
Vesicular volcanic rock (likely pumice or scoria)
Pumice/scoria; predominantly volcanic glass and feldspar-rich silicate material
AI-generated identification · may be incorrectLight tan, highly porous, dull to slightly vitreous; hardness about 5–6, irregular fracture, and low density. The abundant rounded cavities are vesicles formed by trapped volcanic gas; pumice may float, while scoria is denser and commonly darker.
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Physical properties
Light tan, highly porous, dull to slightly vitreous; hardness about 5–6, irregular fracture, and low density. The abundant rounded cavities are vesicles formed by trapped volcanic gas; pumice may float, while scoria is denser and commonly darker.
Formation & geological history
Formed when gas-rich lava erupted explosively and rapidly cooled, preserving bubbles; likely Quaternary or younger, though similar material occurs throughout volcanic history.
Uses & applications
Used as an abrasive, lightweight aggregate, horticultural amendment, concrete additive, and occasional decorative stone. Attractive pieces are sold as geological specimens, but this example appears common and unpolished.
Geological facts
Pumice is frothy volcanic glass; scoria has larger, more interconnected vesicles and typically contains more crystalline minerals. The specimen’s pale color favors pumice, although its relatively dense appearance makes exact identification uncertain from a photograph alone.
Field identification & locations
Common around explosive volcanic fields, ash deposits, and beaches receiving volcanic debris; major sources include Italy, Turkey, Greece, Japan, Mexico, and the western United States. Check whether it floats and examine streak, density, and vesicle texture to distinguish pumice from scoria.
