sedimentary

Likely iron-stained sandstone

Quartz-rich sandstone, variably cemented with iron oxides

AI-generated identification · may be incorrect

Rust-brown, dull and rough, with pale streaks or grains; sandstone is mostly quartz (Mohs 7), but the specimen’s hardness, grain size, and cement cannot be confirmed from the image.

Identified October 15, 2026More sedimentary →

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Physical properties

Rust-brown, dull and rough, with pale streaks or grains; sandstone is mostly quartz (Mohs 7), but the specimen’s hardness, grain size, and cement cannot be confirmed from the image.

Formation & geological history

Likely formed as sand deposited and compacted, then cemented; iron oxides can impart the reddish-brown color. Its age and exact setting cannot be determined visually.

Uses & applications

Sandstone is used as building and paving stone, aggregate, and decorative material; this small rough piece appears to have mainly display or collecting value.

Geological facts

The rounded shape may reflect weathering or transport, while the light markings could be mineral veins or surface abrasion.

Field identification & locations

A sandy, gritty texture and visible sand-sized grains support sandstone identification; a fresh break and close-up would help distinguish it from other iron-rich rocks. Sandstones occur worldwide in sedimentary basins.