sedimentary

Red sandstone pebble

Quartz-rich ferruginous sandstone, likely arkose or subarkose

AI-generated identification · may be incorrect

Fine- to medium-grained, reddish-brown, earthy to dull luster, with visible sand grains and hairline fractures. Predominantly quartz and feldspar cemented by iron oxides; typical hardness about 6–7 for grains but the rock is relatively friable; no prominent cleavage.

Identified September 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, was compacted, and cemented, with iron oxidation producing the red color; the rounded shape indicates later stream or beach abrasion. Its exact geological age cannot be determined from the image and may range from Paleozoic to recent sedimentary deposits.

Uses & applications

Used as building and paving stone, aggregate, landscaping material, and decorative stone; attractive pieces may be collected but are generally not gem-quality.

Geological facts

Red coloration commonly reflects hematite coatings on grains or iron-rich cement. The specimen appears naturally weathered or water-rounded rather than crystalline.

Field identification & locations

Identify by gritty texture, visible sand grains, red iron staining, and scratching glass only weakly or inconsistently as a whole rock; dilute acid typically produces no reaction unless carbonate cement is present. Common in arid, fluvial, coastal, and desert regions.