sedimentary

Weathered sandstone pebble

Sandstone, chiefly quartz (SiO₂) with feldspar and iron-oxide cement

AI-generated identification · may be incorrect

Fine- to medium-grained, dull earthy-brown, porous, and weakly cemented; individual grains are visible, with no obvious cleavage. Typical hardness is about 6–7 for quartz grains, but the rock may crumble or scratch easily because of weathering; specific gravity is roughly 2.2–2.6.

Identified August 18, 2026More sedimentary →

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Physical properties

Formation & geological history

Lithified sand deposited in ancient rivers, beaches, dunes, or shallow marine settings, then compacted and cemented; its precise geological age cannot be determined from the photograph. The rounded shape reflects stream or shoreline abrasion and weathering.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and landscaping material; this small weathered pebble has little practical or jewelry value.

Geological facts

The brown color likely reflects iron-oxide staining, while the dark pits may be weathered grains or small cavities. It is not possible to determine the exact sandstone variety from the image alone.

Field identification & locations

Look for sand-sized grains, gritty texture, rounded edges, and layered or porous structure; a hand lens and dilute acid test can help distinguish it from limestone. Sandstone pebbles are widespread in streambeds, beaches, and glacial deposits.