sedimentary

Weathered sandstone pebble

Sandstone, likely quartz-rich (arkose or quartz arenite)

AI-generated identification · may be incorrect

Typically Mohs 6–7 because of quartz grains; tan-orange, dull to earthy, fine- to medium-grained, and commonly porous with no visible cleavage. The rounded shape and surface pitting indicate prolonged abrasion and weathering.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Lithified sand compacted and cemented by silica, calcite, or iron oxides, likely formed in a river, beach, dune, or nearshore setting. Its exact geological age cannot be determined from the photograph.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and occasionally decorative material; this small specimen has mainly educational or collectible value.

Geological facts

The orange-brown color most likely comes from iron-oxide staining. The object could also be a naturally weathered iron-rich pebble or a shaped sandstone artifact; texture suggests natural stone rather than glass or ceramic.

Field identification & locations

Look for visible sand grains, gritty texture, sedimentary layering, and a streak or coating of iron oxide; a steel nail should generally not scratch quartz-rich sandstone. Common in riverbeds, beaches, deserts, and sedimentary formations worldwide.