sedimentary

Small brown rock fragment, likely sandstone

Quartz-rich sandstone (tentative identification)

AI-generated identification · may be incorrect

Fine-grained, dull brown surface with a rough, granular texture; likely Mohs hardness around 6–7 if quartz-rich. The image is too limited to determine mineral composition, cleavage, or specific gravity confidently.

Identified October 10, 2026More sedimentary →

Explore Small brown rock fragment, likely sandstone 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

Sandstone forms when sand grains—often quartz—are compacted and cemented by silica, calcite, or iron oxides. Its age and depositional setting cannot be determined from the fragment alone.

Uses & applications

Ordinary sandstone is used as building stone, paving, and aggregate; this small fragment has little commercial value unless its provenance makes it significant.

Geological facts

Iron-bearing cement or coatings commonly give sandstone brown, tan, or reddish colors.

Field identification & locations

Look for visible sand-sized grains and a gritty feel; a hand lens can help distinguish sandstone from a single mineral or fine-grained rock. Common worldwide in sedimentary formations; estimated value: under $1 for an unverified fragment.