sedimentary

Weathered sandstone

Quartz-rich sandstone, likely ferruginous arkose or subarkose

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7 for quartz grains, tan to reddish-brown, dull to slightly gritty, with visible sand-sized grains and porous texture; individual grains are cemented by silica, calcite, or iron oxides. The specimen shows weathering and a darker iron- or manganese-stained surface.

Identified September 2, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when deposited sand was compacted and cemented, commonly in rivers, beaches, dunes, or desert environments. Its precise age and locality cannot be determined from the photograph alone.

Uses & applications

Used as building stone, paving, wall veneer, landscaping material, and aggregate; attractive varieties may be cut or polished for decorative use.

Geological facts

The reddish coloration commonly comes from hematite coatings on quartz and feldspar grains. Sandstone may preserve ripple marks, cross-bedding, mud cracks, or fossils, though none are clearly visible here.

Field identification & locations

Identify it by its gritty sand grains, layered or granular texture, and ability to scratch glass if quartz-rich; it generally does not fizz with dilute hydrochloric acid unless calcite-cemented. Common worldwide, especially in sedimentary basins and exposed desert or coastal formations.