sedimentary

Weathered sandstone slab

Quartz-rich sandstone, likely arkose or lithic sandstone

AI-generated identification · may be incorrect

Typically 6–7 Mohs hardness, tan to reddish-brown color, dull to slightly gritty luster, and granular clastic texture; quartz grains are cemented by silica, iron oxides, or carbonate. Bedding is faint or obscured, with no obvious cleavage.

Identified September 5, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in a river, floodplain, dune, or shallow-marine setting; the rusty color reflects oxidized iron. Its exact age cannot be determined from the photograph.

Uses & applications

Used as building stone, paving, walls, landscaping, and aggregate; attractive slabs may be used decoratively. This weathered outdoor piece has little commercial or collector value.

Geological facts

Sandstone commonly develops surface pits, rusty staining, and exfoliation as cement weathers. Individual quartz grains may be visible with a hand lens.

Field identification & locations

Common worldwide, including major outcrops in the southwestern and central United States, Europe, India, and Australia. Confirm with a gritty texture, visible sand grains, and lack of reaction to dilute hydrochloric acid unless carbonate cement is present.