sedimentary

Weathered sandstone pebble

Quartz-rich sandstone; chiefly SiO₂ with possible feldspar, mica, and iron-oxide cement

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7, tan to yellow-brown, dull to faintly sugary or gritty luster, and composed of cemented sand-sized grains. The rounded edges and dark surface line may reflect stream abrasion, bedding, or a fracture; cleavage is absent and specific gravity is about 2.2–2.7.

Identified August 15, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented—often by silica, calcite, or iron oxides—then weathered into a pebble. Its exact geological age cannot be determined from the image; sandstone ranges from Precambrian to modern.

Uses & applications

Used as building and paving stone, aggregate, landscaping material, and occasionally decorative stone. This ordinary pebble has little gem or collector value.

Geological facts

Iron-oxide staining commonly produces the warm tan, rusty coloration. A fresh broken surface should reveal clearly visible sand grains and may feel abrasive.

Field identification & locations

Common in streambeds, beaches, deserts, and sedimentary terrains worldwide; test with a steel nail (usually little/no scratch) and inspect grain texture with a hand lens. Estimated value: $0–$5 as a loose specimen.