sedimentary

Weathered banded sandstone pebble

Quartz-rich sandstone (predominantly SiO₂)

AI-generated identification · may be incorrect

Tan to gray, fine- to medium-grained, with dark gray bedding or mineral-rich bands and a dull earthy luster; typically Mohs 6–7 where quartz-rich, with no obvious cleavage. Rounded edges indicate stream or beach abrasion; exact texture is partly obscured by weathering.

Identified August 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand was deposited, compacted, and cemented—likely by silica, iron oxides, or carbonate—then later eroded into a pebble. Its precise geological age and source formation cannot be determined from the photograph.

Uses & applications

Used as aggregate, building stone, paving, and landscaping material; attractive banded pieces are collected or used decoratively. This individual pebble has little commercial value.

Geological facts

Dark streaks may represent shale-like laminae, iron/manganese staining, or heavy-mineral concentrations rather than true mineral veins. A fresh fracture would reveal grain size and cement more reliably than the weathered surface.

Field identification & locations

Look for visible sand grains, layered bedding, gritty texture, and lack of consistent crystal faces; it should not fizz strongly in dilute hydrochloric acid unless carbonate-cemented. Common in river gravels, beaches, and eroded sandstone terrains worldwide.