sedimentary

Weathered sandstone

Quartz-rich sandstone, likely arkose or lithic sandstone

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7 for quartz grains, with reddish-brown iron-oxide staining, gritty texture, dull to weakly earthy luster, and no obvious cleavage. The slab appears fine- to medium-grained and may show faint bedding or lamination.

Identified August 23, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized quartz and feldspar fragments were deposited, compacted, and cemented, commonly in river, floodplain, dune, or coastal settings. Its exact age cannot be determined from the photograph; weathering has oxidized iron-bearing minerals near the surface.

Uses & applications

Used as building stone, paving, wall stone, aggregate, and landscaping material; attractive pieces may be polished or used decoratively. This ordinary specimen has little gemstone value.

Geological facts

The rusty coloration generally comes from hematite or goethite coatings on grains or cement. Sandstone can preserve sedimentary structures and fossils, although none are clearly visible here.

Field identification & locations

Identify it by its gritty, sandpaper-like surface and visible grains; a steel nail may scratch weaker cemented areas but usually not quartz grains. Common worldwide, especially in sedimentary basins and exposed cliffs.