sedimentary

Banded sandstone

Iron-oxide-stained quartz sandstone

AI-generated identification · may be incorrect

Tan, buff, and reddish-brown bands with a rough, granular texture; mainly quartz grains cemented by silica or iron oxides. Quartz has Mohs hardness 7; sandstone hardness varies with its cement, and its grains show no distinct cleavage.

Identified October 5, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed as sand accumulated in layers and was later compacted and cemented; iron-rich fluids likely produced the reddish bands. Its age cannot be determined from the image alone.

Uses & applications

Sandstone is used as building and paving stone, aggregate, and decorative stone; this specimen is chiefly suitable for collecting or display.

Geological facts

The contrasting bands record changes in sediment composition or later mineral staining, rather than necessarily representing separate rock layers.

Field identification & locations

Look for visible sand-sized grains and a gritty surface; reddish bands commonly indicate iron oxides. Sandstone is widespread in sedimentary basins worldwide.