sedimentary

Rounded sandstone pebble

Sandstone, commonly quartz–feldspar-rich arenite

AI-generated identification · may be incorrect

Usually Mohs hardness 6–7 for quartz grains, with a rough, granular texture, dull to earthy luster, tan coloration, and no prominent cleavage. The rounded shape indicates abrasion during transport; individual grains are cemented by silica, calcite, or iron oxides.

Identified September 5, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, was compacted, and chemically cemented, commonly in rivers, beaches, dunes, or shallow marine basins; the specimen’s exact age and provenance cannot be determined from the image.

Uses & applications

Used as building stone, paving, landscaping material, and aggregate; attractive varieties are used decoratively, but this small pebble has negligible commercial value.

Geological facts

Its pale tan color likely reflects quartz-rich sand with minor iron staining or feldspar. Rounded sandstone pebbles commonly occur in stream gravels, beaches, and conglomerate deposits.

Field identification & locations

Identify it by visible sand grains, gritty texture, moderate weight, and scratching glass only if quartz-rich; it should not fizz strongly with dilute acid unless calcite-cemented. Common worldwide in sedimentary basins and gravel deposits.