sedimentary

Rounded sandstone pebble

Quartz-rich sandstone; exact composition cannot be confirmed from the image

AI-generated identification · may be incorrect

Tan to ochre, dull and fine-grained, with a rounded, water-worn shape. Likely dominated by quartz grains cemented by silica, calcite, or iron oxides; quartz has Mohs hardness 7, but the rock’s hardness varies with its cement.

Identified October 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed as sand deposited and lithified in a sedimentary environment, then rounded by transport in water. Its age and original setting cannot be determined from appearance alone.

Uses & applications

Commonly used as landscaping or decorative stone and collected as a natural pebble; not typically a gem or high-value specimen.

Geological facts

Iron-oxide staining commonly gives sandstone its yellow, tan, or reddish colors. The smooth, rounded outline indicates abrasion during transport.

Field identification & locations

Look for visible sand-sized grains and a gritty texture; sandstone is widespread in sedimentary basins and river deposits worldwide. Image-based estimate: about $1–$10 as an ordinary specimen.