sedimentary

Red-brown sandstone or iron-rich weathering fragment

Quartz-rich sandstone, likely hematite/goethite-stained; exact identification requires testing

AI-generated identification · may be incorrect

Typically Mohs 6–7 if quartz-rich, with earthy red-brown color, dull to slightly silky luster, and granular texture; no obvious cleavage. The porous, rounded surface suggests weathering or abrasion.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely lithified sand cemented by silica, iron oxides, or clay, with its color produced mainly by hematite/goethite coatings; age cannot be determined from the image. Rounded edges may reflect stream or beach transport.

Uses & applications

Used as aggregate, building stone, and occasionally ornamental material; this small ordinary specimen has little commercial or jewelry value.

Geological facts

Iron oxides commonly produce red, orange, and brown coloration in sedimentary rocks. A reddish streak and gritty texture would support an iron-stained sandstone identification.

Field identification & locations

Common in sedimentary terrains worldwide, especially arid and oxidizing environments. Check for visible sand grains, a gritty feel, acid reaction, and streak; a strong reddish-brown streak may indicate abundant iron oxides.