sedimentary

Rounded reddish sandstone pebble

Quartz-rich sandstone, likely ferruginous arkose or litharenite

AI-generated identification · may be incorrect

Fine- to medium-grained, reddish-brown, dull to slightly earthy luster, with visible quartz grains and iron-oxide staining; individual grains are typically Mohs 7, while the rock’s overall hardness is about 5–7 depending on cement. No obvious cleavage; porous granular texture and rounded stream-worn shape.

Identified September 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand was deposited, compacted, and cemented by silica, calcite, or iron oxides, commonly in rivers, deserts, beaches, or alluvial settings. Its exact geological age cannot be determined from the photograph; sandstone ranges from Precambrian to modern.

Uses & applications

Used as aggregate, building stone, paving, and decorative landscaping material; attractive fine-grained pieces may be collected, but this specimen has little commercial value.

Geological facts

The red color generally comes from hematite or other iron oxides coating the grains. Rounding indicates transport by water or prolonged abrasion.

Field identification & locations

Identify by testing for visible sand grains, lack of layering or cleavage, and a gritty texture; dilute acid may fizz if calcite-cemented. Common worldwide, especially in sedimentary basins and streambeds.