sedimentary

Weathered sandstone pebble

Quartz-rich sandstone, commonly arkose or lithic sandstone

AI-generated identification · may be incorrect

Fine- to medium-grained, reddish-brown and tan, with a dull earthy luster and rounded water-worn shape; mostly quartz and feldspar cemented by silica, iron oxides, or calcite. Typical hardness is about 6–7 for grains, though the rock may scratch irregularly; no consistent cleavage.

Identified August 16, 2026More sedimentary →

Explore Weathered sandstone pebble in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in ancient river, shoreline, dune, or desert settings; its exact geological age cannot be determined from the photograph. Iron-oxide staining produces the rusty coloration, while the surface rounding indicates stream or beach transport.

Uses & applications

Commonly used as aggregate, building stone, paving material, and landscaping gravel; attractive pieces may be collected but are generally not gemstone grade.

Geological facts

The visible dark line is likely a natural fracture or iron/mineral-filled vein, not necessarily a fossil. Sandstone commonly preserves sedimentary structures and fossils, although none are clearly visible here.

Field identification & locations

Identify it by visible sand grains, earthy reddish staining, and sedimentary texture; a hand lens and dilute hydrochloric acid can help test cement, though acid reaction may be absent. Common worldwide, especially in riverbeds, beaches, and exposed sedimentary formations.