sedimentary

Rounded ferruginous sandstone pebble

Quartz-rich sandstone, likely iron-oxide cemented (SiO₂-dominant)

AI-generated identification · may be incorrect

Fine-grained, reddish-brown, dull to earthy luster, with rounded water-worn edges and possible iron-oxide specks; estimated Mohs hardness 6–7, no obvious cleavage, and moderate density around 2.3–2.7 g/cm³.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from compacted and cemented sand, later stained or cemented by hematite/goethite; its rounded shape indicates transport by water or surf. Exact geological age cannot be determined from the photograph.

Uses & applications

Commonly used as decorative stone, landscaping aggregate, and occasional lapidary material; this ordinary pebble has little commercial value.

Geological facts

The red-brown color typically reflects microscopic iron oxides rather than abundant metallic iron. Its smooth, flattened form is characteristic of abrasion in stream, beach, or glacial environments.

Field identification & locations

Identify it by its uniform fine grain, earthy reddish color, rounded shape, and lack of visible crystals or strong cleavage; a hand lens may reveal quartz grains. Common worldwide in riverbeds, beaches, and sedimentary terrains.