sedimentary

Weathered reddish sandstone pebble

Quartz-rich sandstone (composition varies; commonly SiO₂-dominated clastic rock)

AI-generated identification · may be incorrect

Fine- to medium-grained, tan-red, dull to earthy luster, rounded by abrasion, with small pores and dark grains. Hardness is roughly 6–7 for quartz grains but the rock may crumble along its cement; no obvious cleavage.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Lithified sand compacted and cemented by silica, iron oxides, or carbonate, then rounded by stream, beach, or glacial transport. Its exact geological age cannot be determined from the photograph.

Uses & applications

Common sandstone is used for building stone, paving, aggregate, and landscaping; this small pebble has mainly educational or modest collecting value.

Geological facts

The reddish color typically reflects hematite coating or cement around quartz grains. Surface weathering and transport have smoothed the original grain boundaries.

Field identification & locations

Identify it by visible sand grains, gritty texture, sedimentary layering or pores, and a lack of interlocking crystals; common worldwide in riverbeds, beaches, and sandstone outcrops.