sedimentary

Weathered sandstone pebble

Quartz-rich sandstone, likely ferruginous sandstone

AI-generated identification · may be incorrect

Fine- to medium-grained tan rock with rusty brown iron-oxide staining, earthy/dull luster, and irregular pits from weathering or softer grains. Hardness is approximately 5–7 Mohs depending on cement; no obvious cleavage; quartz-rich sandstone is commonly granular and porous.

Identified August 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand, chiefly quartz, was compacted and cemented by silica, calcite, or iron oxides, probably in a river, beach, or shallow marine environment. Its precise geological age cannot be determined from the photograph; surface rounding and pitting reflect prolonged abrasion and chemical weathering.

Uses & applications

Ordinary sandstone is used as building stone, paving, aggregate, and occasionally as a carving or decorative material. This small weathered pebble has minimal commercial value but may be a useful local teaching or collecting specimen.

Geological facts

Iron oxides produce the orange-brown coloration, while differential erosion creates the honeycombed texture. The image does not show diagnostic evidence for a fossil or meteorite.

Field identification & locations

Look for visible sand grains, gritty texture, sedimentary layering, and a relatively low density; a steel nail may scratch weaker cemented areas. Common in streambeds, beaches, deserts, and eroding sandstone outcrops.