sedimentary

Weathered sandstone

Quartz-rich clastic sandstone, likely arkosic or feldspathic

AI-generated identification · may be incorrect

Fine- to medium-grained, tan-brown, rough and granular with earthy to dull luster; chiefly quartz and feldspar with clay/iron-oxide cement. Quartz hardness is 7 Mohs, but the rock may crumble along weathered surfaces; no obvious cleavage.

Identified August 27, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, was compacted, and cemented in a river, dune, beach, or shallow-marine setting. Exact age cannot be determined from the image; weathering has produced the friable, iron-stained surface.

Uses & applications

Used as building and facing stone, paving, aggregate, and landscaping material; attractive, durable varieties may be used decoratively. This weathered specimen has modest collector value.

Geological facts

The rusty coloration commonly comes from oxidized iron minerals, especially hematite or limonite. Sandstone texture reflects transported grains rather than interlocking crystals.

Field identification & locations

Identify by visible sand grains, gritty texture, layering or bedding, and a likely scratch from individual quartz grains; dilute acid usually produces little or no fizz unless carbonate cement is present. Common worldwide in sedimentary basins.