sedimentary

Weathered sandstone

Quartz-rich sandstone, likely arkose or feldspathic sandstone

AI-generated identification · may be incorrect

Tan to brown, fine- to medium-grained, granular texture with visible quartz/feldspar and iron-oxide staining; typically Mohs 6–7 for grains but weakly cemented overall, earthy to dull luster, no cleavage, porous, and commonly bedded.

Identified August 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated in rivers, beaches, dunes, or alluvial fans and lithified by compaction and silica, calcite, or iron-oxide cement. Its exact age cannot be determined from the image; sandstone ranges from Precambrian to modern geologic formations.

Uses & applications

Used as building stone, paving, aggregate, and decorative landscaping material; attractive slabs may be used ornamentally, though this specimen appears mainly a common field rock.

Geological facts

The rusty coloration generally reflects oxidized iron minerals, while the pale grains are probably quartz and feldspar. Weathering has rounded and weakened the exposed surfaces.

Field identification & locations

Identify it by gritty sand-sized grains, layered or massive sedimentary fabric, and ability to scratch glass if quartz-rich; dilute acid may fizz only if carbonate cement is present. Common worldwide, especially in sedimentary basins and desert or river environments.