sedimentary

Rounded sandstone pebble

Quartz-rich sandstone (likely arkose or lithic sandstone)

AI-generated identification · may be incorrect

Tan-orange, fine-grained, dull to earthy luster, with a rounded water-worn shape and faint surface pores; likely Mohs hardness 6–7 because of abundant quartz. Individual grains and bedding are not clearly visible, so exact identification is uncertain from the image.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand grains— chiefly quartz with possible feldspar or rock fragments—were compacted and cemented, then rounded by stream or beach transport. Its depositional age cannot be determined visually and may range from ancient to recent.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and landscaping material; a small rounded pebble has mainly decorative or educational value.

Geological facts

The orange color commonly results from iron-oxide coatings or cement. Water-worn rounding indicates transport after lithification, or reworking of sandstone fragments.

Field identification & locations

Look for visible sand grains, gritty texture, porous surfaces, and weak layering; a streak or acid test is usually unhelpful. Sandstone pebbles occur widely in riverbeds, beaches, and gravel deposits worldwide.