sedimentary

Iron-stained sandstone

Quartz-rich sandstone, likely ferruginous sandstone

AI-generated identification · may be incorrect

Tan to rusty brown with a darker reddish-purple weathered surface; visibly granular and rough, likely quartz-rich. Quartz grains have Mohs hardness 7, but the rock’s hardness and strength vary with cementation; crystal structure is not visible at this scale.

Identified September 30, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand grains accumulated, compacted, and were cemented, with iron oxides producing the rusty coloration. Its age and precise depositional setting cannot be determined from the image.

Uses & applications

Common sandstone is used as building and paving stone, aggregate, and landscaping material; this rough specimen is mainly suitable for collecting or display.

Geological facts

Iron oxides such as hematite or goethite can stain sandstone red, brown, or purple. The exposed tan interior and darker outer rind may reflect weathering or surface staining.

Field identification & locations

Look for sand-sized grains and a gritty texture; a hand lens may reveal quartz grains and iron-rich cement. Sandstone occurs worldwide in sedimentary basins; this specimen’s location is unknown.