sedimentary

Weathered sandstone or iron-stained sedimentary rock

Quartz-rich sandstone, likely ferruginous sandstone (SiO₂-dominated)

AI-generated identification · may be incorrect

Tan to yellow-brown, fine- to medium-grained, earthy/matte luster with visible layering and iron-oxide staining; hardness about 6–7 for quartz grains, generally porous, with no obvious cleavage. The dark patches may be weathering or a minor clay/iron-rich layer.

Identified September 7, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, was compacted, and cemented by silica, iron oxides, or carbonate; later surface weathering produced its rounded shape and coloration. Exact geological age and locality cannot be determined from the photograph.

Uses & applications

Common sandstone is used as building and paving stone, aggregate, and occasionally decorative material; this small fragment has little commercial value unless it comes from a notable formation.

Geological facts

Iron oxides such as hematite and goethite commonly create yellow, orange, and reddish sandstone colors. Layering and gritty texture distinguish it from many massive igneous rocks.

Field identification & locations

Look for individual sand grains, bedding, porosity, and a gritty feel; a steel nail generally will not scratch quartz-rich grains, though it may scratch softer cement. Common worldwide in sedimentary basins; examine a fresh break for texture.