sedimentary

Weathered sandstone pebble

Quartz-rich sandstone, likely ferruginous sandstone

AI-generated identification · may be incorrect

Tan to reddish-brown, dull to slightly granular luster, and visibly sandy texture with iron-oxide staining; hardness about 6–7 overall, though individual grains are mainly quartz. No clear crystals or cleavage are visible; specific gravity is typically 2.2–2.7.

Identified September 9, 2026More sedimentary →

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Physical properties

Formation & geological history

Lithified sand compacted and cemented by silica, calcite, or iron oxides, then rounded and weathered as a loose pebble. Its exact geological age cannot be determined from the image; sandstone ranges from Precambrian to modern formations.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and ornamental material; attractive pieces may be collected but generally have little commercial value.

Geological facts

The rusty color commonly comes from hematite or limonite cement coating quartz grains. A rough, gritty surface and granular break distinguish it from many uniform igneous rocks.

Field identification & locations

Look for clearly visible sand grains, a gritty feel, and layering or iron-stained patches; a glassy scratch test may show quartz-rich hardness. Common worldwide, especially in sedimentary basins and stream beds.