sedimentary

Quartz-rich sandstone

Sandstone, composed mainly of quartz (SiO₂) with iron-oxide cement

AI-generated identification · may be incorrect

Light tan to brown, granular and rough, with a dull to slightly earthy luster; individual sand grains and rusty iron staining are visible. Hardness is typically about 6–7 for quartz grains, though the rock may crumble along weak cement; no obvious cleavage, and density is commonly 2.2–2.7 g/cm³.

Identified September 21, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, was compacted, and cemented by silica, calcite, or iron oxides, likely in a river, beach, dune, or shallow-marine setting. Its precise geological age cannot be determined from the image.

Uses & applications

Used as building stone, paving, aggregate, and dimension stone; attractive pieces may be collected, but this specimen has modest commercial value.

Geological facts

The rusty coloration commonly reflects hematite or goethite cement. Sandstone’s grain size and cement type often reveal the depositional environment.

Field identification & locations

Identify it by visible sand-sized grains, gritty texture, and lack of interlocking crystals; a steel nail usually scratches weakly cemented surfaces, while quartz grains resist scratching. Common worldwide in sedimentary basins.