sedimentary

Rounded yellow sandstone pebble

Quartz-rich sandstone, likely ferruginous or calcareous sandstone

AI-generated identification · may be incorrect

Fine-grained, matte to faintly earthy luster; pale ochre-yellow color from iron oxides or carbonate cement. Likely hardness ~6–7 where quartz-rich, with low-to-moderate density and no visible cleavage; rounded by abrasion.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized grains—mostly quartz—were compacted and cemented in an ancient beach, river, dune, or shallow-marine environment, then eroded into a pebble. Its exact geological age cannot be determined from the photograph.

Uses & applications

Typically used as a decorative pebble, landscaping stone, or geological teaching specimen; not generally valuable for jewelry or construction in this small form.

Geological facts

The smooth, flattened shape indicates prolonged transport or wave abrasion. Yellow coloration commonly reflects limonite/goethite coatings, though calcite cement can produce similar tones.

Field identification & locations

Identify by granular texture, relatively dull surface, rounded shape, and possible grain release when scratched; test with dilute hydrochloric acid for carbonate cement. Common in riverbeds, beaches, conglomerates, and sandstone outcrops worldwide.