sedimentary

Weathered sandstone or iron-stained sedimentary rock

Quartz-rich sandstone, likely limonitic/goethitic cement

AI-generated identification · may be incorrect

A tan-brown, dull to earthy, granular specimen with visible sand-sized grains and iron-oxide staining; quartz-rich sandstone is typically Mohs 6–7 in individual grains, with no obvious cleavage and variable porosity. The rounded edges suggest weathering or abrasion.

Identified September 5, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms when deposited sand is compacted and cemented, commonly by silica, calcite, or iron oxides; the brown color reflects oxidation of iron-bearing minerals. Its exact geological age cannot be determined from the image.

Uses & applications

Common sandstone is used for building stone, paving, aggregate, and landscaping; attractive iron-stained pieces may be collected but generally have low commercial value.

Geological facts

The specimen may also be a weathered ferruginous rock or altered quartzite; a close photograph cannot establish the diagnosis confidently.

Field identification & locations

Look for gritty texture, visible sand grains, and a rough fracture; it should not fizz in dilute hydrochloric acid unless carbonate cement is present. Common worldwide in sedimentary basins and exposed outcrops.