sedimentary

Small rounded pebble, likely weathered sandstone or iron-rich rock

Indeterminate; possibly quartz-rich sandstone (SiO₂) with iron-oxide staining

AI-generated identification · may be incorrect

Tan-brown, granular and matte, with an irregular rounded shape; apparent hardness about 5–7 Mohs if sandstone/quartz-rich, with no visible cleavage or crystals. The image resolution is insufficient for a definitive identification.

Identified August 27, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed from cemented sand grains, then rounded by weathering or transport; sandstone commonly ranges from Paleozoic to modern geological ages and occurs in sedimentary basins worldwide.

Uses & applications

Common material has little commercial value as an isolated pebble, though sandstone is used as building stone, paving, aggregate, and decorative material.

Geological facts

Iron oxides commonly produce the brown, rust-colored coloration in sandstone and other weathered rocks.

Field identification & locations

Look for visible sand grains, scratching by steel, and lack of fizz with dilute hydrochloric acid; a close-up, hardness test, streak test, and locality would improve identification. Common in stream beds, beaches, and weathered outcrops.