sedimentary

Weathered quartz-rich sandstone

Quartz arenite to feldspathic sandstone, primarily SiO₂ with minor feldspar, mica, and iron oxides

AI-generated identification · may be incorrect

Typically Mohs 6–7 for quartz grains; tan, cream, and rusty brown, with a dull to slightly glassy luster and visibly granular texture. Bedding is weakly apparent; no consistent cleavage, and iron staining produces the reddish-brown areas.

Identified August 23, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand accumulated, was compacted, and cemented by silica, carbonate, or iron oxides; the weathering surface likely reflects oxidation and erosion. Its precise geological age cannot be determined from the image and depends on the source formation.

Uses & applications

Used as construction aggregate, fill, paving stone, and occasionally building or decorative stone when sufficiently durable. Ordinary pieces have little jewelry value.

Geological facts

The pale grains are likely quartz, while rusty coloration commonly comes from hematite or limonite coatings. A glassy quartz grain can scratch ordinary steel or glass, whereas carbonate cement may react weakly with dilute acid.

Field identification & locations

Look for sand-sized grains, sedimentary layering, earthy weathering, and a gritty fracture; a hand lens helps distinguish quartz from feldspar. Common worldwide in sedimentary basins and river or quarry deposits.