sedimentary

Rounded sandstone pebble

Quartz-rich sandstone (likely arkosic or lithic sandstone)

AI-generated identification · may be incorrect

Fine-grained, tan, dull-to-satin surface with scattered dark grains or lithic fragments; mostly quartz with feldspar, rock fragments, and cement. Typical hardness is about 6–7 for the grains, with no visible cleavage; specific gravity roughly 2.2–2.7.

Identified September 8, 2026More sedimentary →

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Physical properties

Formation & geological history

Originally deposited as sand, then compacted and cemented into sandstone; water or wave abrasion produced its smooth shape. Its exact geological age and source cannot be determined from the photograph.

Uses & applications

Used mainly as a decorative, educational, or landscape stone; sandstone may also be used for building stone and aggregate. This ordinary pebble has little commercial or jewelry value.

Geological facts

The rounded form indicates prolonged transport in a stream, beach, or gravel deposit. Small dark inclusions may be iron-bearing minerals, magnetite, or lithic fragments.

Field identification & locations

Identify it by its sandy granular texture, tan color, rounded abrasion, and lack of prominent crystals or foliation; a hand lens may reveal quartz grains. Common in riverbeds, beaches, glacial deposits, and sandstone-derived gravels.