sedimentary

Weathered sandstone pebble

Quartz-rich sandstone (predominantly SiO₂ grains cemented by silica, calcite, or iron oxides)

AI-generated identification · may be incorrect

Tan-brown, dull and granular, with rounded edges from abrasion; sandstone grains are typically Mohs 6–7, though cement strength varies. The image does not resolve grain size or cement well enough for a more specific identification.

Identified October 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in environments such as rivers, beaches, or deserts; age cannot be determined from the image.

Uses & applications

Sandstone is used as building and paving stone, aggregate, and landscaping material; this pebble is mainly suitable for collecting or display.

Geological facts

Brown coloration commonly comes from iron-oxide staining, and rounded form suggests transport or prolonged surface weathering.

Field identification & locations

The visible tan, granular texture and rounded shape are consistent with a sandstone pebble, but a close-up or hardness test would help confirm it. Sandstone occurs worldwide in sedimentary basins.