sedimentary

Weathered iron-rich sandstone or ironstone

Ferruginous sandstone, likely limonite/goethite-cemented quartz arenite

AI-generated identification · may be incorrect

Typically quartz-rich with iron oxides/hydroxides; Mohs hardness about 6–7 for quartz matrix, with softer earthy limonite zones. Brown, ochre, tan, and purplish weathering colors; dull to earthy luster, granular texture, and no consistent cleavage. The image alone cannot confirm the exact mineralogy.

Identified August 8, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand was lithified and later cemented or stained by oxidized iron-bearing groundwater; weathering produced the irregular surface. Its age depends on locality and cannot be determined visually.

Uses & applications

Used locally as building or landscaping stone and collected as a geological specimen; generally unsuitable for jewelry unless polished for decorative use.

Geological facts

The metallic-looking sheen is likely reflected light from iron-rich surfaces rather than true metal. A rusty streak or reddish-brown powder commonly indicates hematite or limonite.

Field identification & locations

Look for visible sand grains, gritty texture, and red-brown iron staining; a steel nail should generally scratch the softer cement but not quartz grains. Common in terrestrial sedimentary basins worldwide.