sedimentary

Mixed rounded gravel and weathered rock fragments

Polymictic alluvial or glacial gravel; composition appears to include basaltic, quartz-rich, and feldspathic clasts

AI-generated identification · may be incorrect

Mostly subrounded pebbles in gray, brown, and reddish tones, with dull to slightly granular luster and no visible dominant crystal structure. Hardness varies roughly from 3–7 Mohs depending on clast; the fine matrix is sand, silt, and weathered minerals.

Identified August 23, 2026More sedimentary →

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Physical properties

Formation & geological history

Produced by mechanical weathering and transport in a stream, floodplain, or glacial deposit; individual clasts may range from ancient to relatively young, while the deposit itself is likely Quaternary. Rounded shapes indicate abrasion during transport.

Uses & applications

Used as aggregate for paths, drainage, landscaping, concrete, and road construction; individual pieces have little jewelry or collector value.

Geological facts

This is not a single rock specimen but a natural heterogeneous sediment containing multiple lithologies. The reddish and dark pebbles may represent weathered volcanic or metamorphic rocks, while pale fragments may be quartz, feldspar, or carbonate.

Field identification & locations

Identify it by mixed lithologies, unconsolidated sandy matrix, and rounded clasts; acid testing and streak/hardness tests can distinguish carbonate from silicate pieces. Common in river terraces, beaches, glacial outwash, and fill deposits.