sedimentary

Weathered iron-rich sandstone or ferruginous quartzite

Ferruginous sandstone; possibly hematite/goethite-cemented quartzite

AI-generated identification · may be incorrect

Coarse, strongly weathered brown-gray rock with rusty orange iron-oxide staining and pale quartz-rich patches. Quartz gives hardness about 7 Mohs; luster is dull to earthy, with no obvious cleavage and likely moderate-to-high density.

Identified August 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Probably formed from quartz sand cemented by iron oxides, then compacted and lithified; if metamorphosed, it may be quartzite. Iron staining developed later through groundwater weathering, commonly during the Paleozoic or younger, depending on locality.

Uses & applications

Common material has limited commercial value but may be crushed for aggregate or used as landscaping stone; attractive pieces can be collected as ironstone specimens.

Geological facts

The orange-red coloration typically comes from hematite and goethite rather than the primary quartz grains. Differential weathering can produce the irregular, layered appearance visible here.

Field identification & locations

Identify by its gritty quartz texture, rusty streaks, and resistance to scratching; a steel nail should generally not scratch quartz-rich surfaces. Common in sedimentary basins, ironstone beds, weathered outcrops, and gravel deposits worldwide; exact identification requires a fresh break or thin section.