sedimentary

Weathered sandstone fragment

Quartz-rich sandstone, likely arkosic or lithic sandstone

AI-generated identification · may be incorrect

Tan-gray, dull to weakly granular surface with visible sand-sized grains; likely Mohs 6–7 for quartz grains, nonmetallic luster, no obvious cleavage, and moderate porosity. The specimen appears fine- to medium-grained and somewhat weathered.

Identified August 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, was compacted, and cemented by silica, calcite, or iron oxides; its precise geological age cannot be determined from the image. Commonly develops in rivers, beaches, deserts, deltas, and sedimentary basins.

Uses & applications

Used as building stone, paving, aggregate, and occasionally as a decorative stone; this small, unpolished fragment has little commercial value.

Geological facts

Sandstone color reflects cement and impurities: iron oxides produce red or brown tones, while quartz-rich material is pale gray or tan. Individual grains may be examined with a hand lens.

Field identification & locations

Identify it by gritty texture, visible rounded or angular grains, and sedimentary layering or bedding if present; a steel nail usually will not scratch quartz-rich grains. Common worldwide, including Utah, Arizona, Colorado, England, India, and Australia.