sedimentary

Weathered sandstone pebble

Quartz-rich sandstone, likely ferruginous sandstone

AI-generated identification · may be incorrect

Fine-grained, rounded tan-to-brown pebble with dull earthy luster and possible iron-oxide staining; mainly quartz with feldspar, clay minerals, and iron oxides. Hardness is approximately 5–7 Mohs, with no obvious cleavage; individual grains and layering may be visible under magnification.

Identified September 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand was compacted and cemented, probably by silica or iron-bearing minerals, then rounded by stream or wave abrasion. Its precise geological age cannot be determined from the photograph; sandstone ranges from Precambrian to modern formations.

Uses & applications

Commonly used as building stone, paving, aggregate, and decorative material; this small weathered specimen has minimal commercial value but may interest beginning collectors.

Geological facts

The yellow, orange, and brown colors commonly reflect limonite or hematite coatings on quartz grains. The dark surface marks may be weathering fractures or iron-rich bands.

Field identification & locations

Identify it by visible sand grains, gritty texture, muted earthy color, and lack of glassy crystal faces; a streak, acid, and magnification test can help distinguish sandstone from altered volcanic rock. Common worldwide, especially in riverbeds, beaches, and sedimentary basins.