sedimentary

Rounded sandstone pebble

Quartz-rich sandstone, likely lithic or arkosic sandstone

AI-generated identification · may be incorrect

Gray-beige, fine-grained, matte to slightly gritty surface, with indistinct sedimentary layering and rounded edges from abrasion. Estimated Mohs hardness 6–7 for quartz grains; no visible cleavage, and typically low-to-moderate specific gravity around 2.2–2.7.

Identified September 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized grains were compacted and cemented, probably by silica, iron oxides, or carbonate. Its rounded shape indicates stream or beach transport; the depositional age cannot be determined from the photograph.

Uses & applications

Common sandstone is used as building and paving stone, aggregate, and occasionally ornamental material. This small specimen has mainly educational or casual collecting value.

Geological facts

The subtle diagonal bands may represent bedding or cross-bedding, recording ancient currents or migrating dunes. Surface weathering can soften the rock and accentuate differences between cement and grains.

Field identification & locations

Identify it by visible sand grains, gritty texture, muted earthy color, and layering; a streak or fresh break is more diagnostic than the weathered exterior. Sandstone is widespread in riverbeds, beaches, deserts, and sedimentary basins worldwide.