sedimentary

Red sandstone fragment

Quartz-rich sandstone, likely iron-oxide-stained arenite

AI-generated identification · may be incorrect

Rough, granular, reddish-orange fragment with a dull to slightly gritty surface; likely mostly quartz grains cemented by iron oxides. Quartz has Mohs hardness 7, but the rock’s overall hardness depends on its cement and grain bonding; crystal structure is not visible at this scale.

Identified October 3, 2026More sedimentary →

Explore Red sandstone fragment 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 as sand deposited and compacted in a sedimentary environment, then cemented; red coloration commonly comes from hematite or other iron oxides. The image alone cannot establish its geological age or precise origin.

Uses & applications

Sandstone is widely used as building and paving stone, aggregate, and decorative material; this small fragment has little practical value.

Geological facts

Red beds form when iron oxidizes in sediments, often in terrestrial settings. A hand lens can reveal the individual sand grains and cement.

Field identification & locations

The reddish color and visibly granular, fractured texture are consistent with sandstone; common worldwide, especially in sedimentary basins and exposed red-bed formations. Similar-looking rocks can include iron-rich siltstone.