sedimentary

Weathered sandstone pebble

Quartz-rich sandstone, likely iron-oxide-stained (SiO₂-dominant)

AI-generated identification · may be incorrect

Hardness about 6–7; tan to reddish-brown, dull earthy luster, fine granular texture, and no obvious cleavage. Rounded surfaces and pits indicate abrasion and weathering; exact mineralogy cannot be confirmed from the image alone.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Lithified sand cemented by silica, calcite, or iron oxides, then exposed and rounded in a stream, beach, or glacial environment. Its depositional age is indeterminate without locality and laboratory analysis.

Uses & applications

Used as aggregate, building stone, paving material, and occasionally as a decorative stone; this ordinary pebble has little jewelry value.

Geological facts

The rusty coloration commonly comes from hematite or goethite coatings between quartz grains. The smooth shape reflects prolonged transport or wave abrasion.

Field identification & locations

Identify it by visible sand grains, earthy reddish staining, sedimentary layering, and lack of crystal faces; a streak, acid, hardness, and thin-section test can refine identification. Sandstone pebbles occur worldwide in riverbeds, beaches, and gravel deposits.