sedimentary

Weathered sandstone pebble

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

AI-generated identification · may be incorrect

Tan, dull and fine-grained with a rounded, weathered shape; likely Mohs hardness about 6–7 for quartz grains, though cement affects durability. Individual crystals and cleavage are not apparent in the image.

Identified October 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented into rock, then weathered and rounded by transport. Its geological age cannot be determined from the photograph.

Uses & applications

Commonly used as building and paving stone, aggregate, and landscaping material; this small specimen is mainly suitable for collecting.

Geological facts

Sandstone’s visible grains and cement record ancient sedimentary environments such as beaches, rivers, and deserts.

Field identification & locations

The warm tan color and granular surface are consistent with sandstone, but close inspection or a hand lens is needed to distinguish it from other fine-grained rocks. Sandstone occurs worldwide in sedimentary basins.