sedimentary

Orange sandstone or iron-stained quartz-rich rock

Quartz arenite to arkosic sandstone; primarily SiO₂ with iron-oxide cement

AI-generated identification · may be incorrect

Fine- to medium-grained, porous and crumbly, with orange-brown coloration from hematite/goethite staining; quartz-rich grains have Mohs hardness ~7, but the weakly cemented rock breaks easily. Typically dull to slightly gritty, with no obvious cleavage.

Identified August 30, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in a river, beach, desert, or other sedimentary environment; the image does not permit a reliable geological age, which may range from recent to hundreds of millions of years.

Uses & applications

Used as building stone, paving, aggregate, and decorative material; small natural fragments have modest collecting interest unless from a notable locality.

Geological facts

The orange color commonly reflects oxidation of iron-bearing minerals during weathering or groundwater alteration. A streak or powder that is reddish-brown supports iron-oxide staining.

Field identification & locations

Look for visible sand grains, bedding, porosity, and gritty texture; dilute hydrochloric acid should not fizz unless carbonate cement is present. Common worldwide, especially in sedimentary basins and desert regions.