sedimentary

Pink sandstone pebble

Quartz-rich sandstone, likely arkosic or ferruginous sandstone

AI-generated identification · may be incorrect

Fine- to medium-grained, rounded, pink-tan, and dull to weakly earthy luster; chiefly quartz with feldspar and iron-oxide cement. Quartz hardness is 7 Mohs, but the whole rock may scratch or crumble somewhat depending on cement; bedding is not obvious in this rounded specimen.

Identified August 26, 2026More sedimentary →

Explore Pink sandstone pebble in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed when sand was deposited, compacted, and cemented, with iron oxides producing the pink coloration; subsequently rounded by stream or beach transport. Its exact geological age and locality cannot be determined from the photograph.

Uses & applications

Used as building and paving stone, aggregate, and decorative stone; attractive pieces may be collected or polished, but this specimen has modest commercial value.

Geological facts

The pink color commonly reflects hematite or other iron-oxide coatings on quartz and feldspar grains. A granular texture and occasional visible sand grains distinguish sandstone from massive quartz or quartzite.

Field identification & locations

Common in sedimentary basins worldwide, including the Colorado Plateau and many continental river deposits. Test for gritty grains, weak acid reaction, and sedimentary layering; a streak or broken surface is more diagnostic than the rounded exterior.