sedimentary

Red sandstone fragment

Ferruginous sandstone, chiefly quartz (SiO₂) with iron-oxide cement

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7 for quartz grains, earthy reddish-orange color, dull to faintly gritty luster, porous texture, and no cleavage; visible rounded grains and weathering pits are consistent with sandstone.

Identified August 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented—here likely by hematite/goethite—in a terrestrial or shallow-marine setting. Its exact geological age cannot be determined from the image and may range from ancient to relatively young.

Uses & applications

Used as building and paving stone, aggregate, and historically for masonry; attractive pieces may be collected, though this specimen appears ordinary rather than gem quality.

Geological facts

The red color reflects oxidized iron, commonly called “rust” in geological terms. Sandstone can preserve cross-bedding, ripple marks, and fossils, although none are clearly visible here.

Field identification & locations

Identify it by its sandy, granular feel, reddish iron staining, and tendency to shed individual grains; a steel nail may scratch the cement but not quartz grains. Common worldwide, especially in arid continental basins and red-bed formations.