sedimentary

Rounded sandstone pebble

Quartz-rich sandstone; commonly arkose or lithic sandstone

AI-generated identification · may be incorrect

Fine- to medium-grained, tan-pink, dull to slightly gritty surface with visible sand-sized grains; likely composed mainly of quartz and feldspar with minor rock fragments and iron oxides. Mohs hardness is about 6–7 for individual quartz grains, but the rock is relatively friable;…

Identified August 13, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, was compacted, and cemented by silica, calcite, or iron minerals; its rounded shape indicates later abrasion in a stream, beach, or gravel deposit. The precise geological age cannot be determined from the photograph.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and decorative material; this small rounded specimen has little commercial value but may be useful for teaching or collecting.

Geological facts

The granular texture distinguishes sandstone from crystalline rocks such as granite. Pink coloration commonly reflects potassium feldspar or iron-oxide staining.

Field identification & locations

Identify it by its visibly cemented sand grains, gritty texture, and lack of large interlocking crystals; a hand lens and dilute acid test can help distinguish cement types. Sandstone pebbles occur widely in river gravels, beaches, and sedimentary terrains worldwide.