sedimentary

Weathered sandstone fragment

Quartz-rich sandstone, likely arkosic or ferruginous sandstone

AI-generated identification · may be incorrect

Tan to reddish-brown, granular and dull to earthy in luster, with visible sand-sized grains and possible iron-oxide staining. Predominantly quartz with feldspar and minor clay/iron oxides; hardness about 6–7 for grains, but the rock breaks readily along cemented boundaries; no obvious cleavage.

Identified August 30, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, compacted, and cemented in a terrestrial or shallow-marine environment; the exact geological age cannot be determined from the photograph. Weathering has rounded and loosened the fragment.

Uses & applications

Used as building stone, paving, aggregate, and occasionally decorative stone; this small weathered piece has negligible commercial value.

Geological facts

Sandstone color commonly reflects cement: iron oxides produce yellow, orange, or red tones, while silica cement gives a harder, lighter rock.

Field identification & locations

Identify it by gritty texture, visible sand grains, and lack of strong crystalline sparkle or cleavage; common worldwide, especially in sedimentary basins. A hand lens, streak/acid tests, and hardness testing would improve identification.