sedimentary

Weathered sandstone

Quartz-rich sandstone, commonly arkose or lithic sandstone

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7 because of quartz; the specimen appears pinkish-brown, granular, dull to slightly earthy, and lacks obvious cleavage. Sand grains are cemented together, likely by silica, iron oxides, or calcite.

Identified August 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated in rivers, beaches, dunes, or shallow marine settings and lithified through compaction and cementation. Its exact geological age cannot be determined from the image; sandstone ranges from Precambrian to modern formations.

Uses & applications

Used as building stone, paving, wall material, aggregate, and occasionally sculpture stone; attractive varieties are collected or used decoratively. This ordinary piece has minimal commercial value.

Geological facts

The pink coloration commonly reflects feldspar or iron-oxide staining, while visible grains indicate clastic sedimentary origin. Weathering rounds edges and can loosen surface grains.

Field identification & locations

Identify sandstone by its gritty texture, visible sand-sized grains, layered or speckled appearance, and possible weak scratching of glass; acid reaction suggests calcite cement. Common worldwide, especially in sedimentary basins and river gravels.