sedimentary

Tumbled sandstone pebble

Sandstone, primarily quartz (SiO₂) with feldspar and iron-oxide cement

AI-generated identification · may be incorrect

Typically Mohs 6–7 for quartz grains, but variable overall; tan-brown, matte to slightly earthy luster, visibly granular texture, and weak or no cleavage. The rounded shape and parallel darker bands suggest natural abrasion of layered sandstone.

Identified August 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented—likely during a sedimentary basin’s burial history; its precise geological age cannot be determined from the image. Later transported and rounded by water or glacial movement, or artificially tumbled.

Uses & applications

Used as building and paving stone, aggregate, landscaping material, and decorative specimens; this small piece has mainly educational or modest collecting value.

Geological facts

Iron oxides commonly produce the brown coloration, while bedding or cross-bedding creates the visible bands. Sandstone can preserve ripple marks, fossils, and ancient environmental clues.

Field identification & locations

Look for individual sand grains, layered bedding, and a gritty feel; it should not fizz with dilute acid unless carbonate cement is present. Common worldwide, especially in river gravels and sedimentary-rock regions.