sedimentary

Red sandstone

Quartz-rich sandstone, likely iron-oxide-cemented (exact identification requires closer examination)

AI-generated identification · may be incorrect

Reddish-pink, dull and granular with a rough, weathered surface; chiefly quartz grains, commonly with feldspar and iron oxides. Quartz has Mohs hardness 7, but sandstone strength and texture vary with cementation; crystal structure is not visible in the rock.

Identified October 4, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed as sand accumulated and was compacted and cemented, with iron oxides producing the red color. Sandstones span many geological ages; the specimen’s age and depositional setting cannot be determined from the image.

Uses & applications

Sandstone is used as building and paving stone, aggregate, and sometimes ornamental stone; this small rough piece has little commercial value.

Geological facts

The red hue commonly comes from hematite or other iron-oxide coatings on grains or cement.

Field identification & locations

Look for visible sand-sized grains and a gritty texture; red sandstone is widespread in sedimentary basins worldwide. Approximate value: $1–$10 as an ordinary unlabelled hand specimen.