sedimentary

Weathered sandstone fragment

Quartz-rich sandstone, likely arkose or subarkose

AI-generated identification · may be incorrect

Usually 6–7 Mohs, pale tan to gray, dull to subtly granular luster, and composed of cemented sand-sized grains; no obvious cleavage. The blocky, weathered shape and visible granular texture support sandstone, though the photograph cannot determine exact composition.

Identified August 30, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and became cemented—commonly by silica, calcite, or iron oxides—during burial. Its precise geological age and depositional environment cannot be established from the image alone.

Uses & applications

Commonly used as building stone, paving, landscaping material, and aggregate; attractive varieties are used for slabs and carvings. This fragment has little commercial value.

Geological facts

Sandstone color reflects grain composition and cement: iron oxides produce red or yellow tones, while quartz-rich varieties are pale gray or tan. Weathering can make the surface appear smoother and less distinctly granular.

Field identification & locations

Identify it by its sandpaper-like grain, visible quartz/feldspar particles, and tendency to scratch glass if quartz-rich; acid testing is usually weak unless calcite cement is present. Common worldwide, especially in sedimentary basins and former shore, river, dune, or desert environments.