sedimentary

Rounded brown sandstone pebble

Clastic sandstone, commonly quartz–feldspar-rich; exact type cannot be determined from the image

AI-generated identification · may be incorrect

Fine- to medium-grained, brown and subrounded, with a dull earthy to weakly gritty luster and visible surface pits/fractures. Typically Mohs hardness ~6–7 for quartz-rich sandstone, though cement and grain hardness vary; no obvious cleavage or crystals are visible.

Identified September 5, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from compacted and cemented sand, probably deposited in a river, beach, or dune environment, then rounded by abrasion during transport. Its precise geological age cannot be established visually and may range from relatively young sediment to ancient bedrock.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and occasionally decorative material; this small pebble has mainly educational or collecting value.

Geological facts

The rounded shape indicates substantial transport or wave abrasion. Brown coloration commonly comes from iron-oxide coatings or cement between quartz and feldspar grains.

Field identification & locations

Look for visible sand grains, gritty texture, and layered or porous surfaces; dilute acid usually produces little or no reaction unless carbonate cement is present. Sandstone pebbles occur widely in streambeds, beaches, and glacial deposits.