sedimentary

Red sandstone pebble

Quartz-rich ferruginous sandstone, likely iron-oxide-stained arenite

AI-generated identification · may be incorrect

Fine-grained, rounded, reddish-brown, and matte to slightly earthy; chiefly quartz with feldspar and iron oxides. Hardness about 6–7 for grains, no visible cleavage, porous to weakly cemented, with typical specific gravity around 2.2–2.6.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand was deposited, compacted, and cemented, then colored by hematite or other iron oxides; age cannot be determined from the photograph and may range from ancient to modern. Its rounded shape indicates transport by a river, beach, or glacial environment.

Uses & applications

Commonly used as aggregate, landscaping stone, paving, and building sandstone; this small pebble has minimal commercial value but may be used decoratively.

Geological facts

Red coloration generally reflects oxidized iron rather than the rock’s primary minerals. Weathering and transport can smooth sandstone into durable river or beach pebbles.

Field identification & locations

Identify by its sandy texture, reddish iron staining, rounded form, and possible grainy surface; a steel nail may scratch weak specimens, while quartz grains resist scratching. Common in sedimentary basins, riverbeds, beaches, and glacial deposits worldwide.