sedimentary

Weathered sandstone (probable)

Quartz-rich sandstone; mainly SiO₂ with feldspar and lithic grains

AI-generated identification · may be incorrect

Small tan-brown, granular specimen with a dull-to-earthy luster and visibly cemented sand grains; estimated Mohs hardness 6–7, with no obvious cleavage. Individual grains and texture are more diagnostic than crystal form; density is typically about 2.2–2.7 g/cm³.

Identified August 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms when sand accumulates, compacts, and is cemented by silica, calcite, or iron oxides; the reddish-brown color commonly reflects iron staining. The image cannot establish its geological age, which may range from Precambrian to modern sedimentary deposits.

Uses & applications

Used as building stone, paving, wall veneer, aggregate, and occasionally an ornamental material; this small fragment has minimal commercial value.

Geological facts

Quartz-rich sandstone commonly resists weathering better than feldspathic varieties, producing cliffs, arches, and durable layers. A glassy scratch test may help distinguish quartz-rich sandstone from softer muddy rocks.

Field identification & locations

Look for visible sand grains, layered or porous texture, and a gritty feel; acid fizz suggests calcite cement. Common worldwide, especially in former beaches, dunes, river channels, and sedimentary basins; precise identification requires a close-up and scratch/acid tests.