sedimentary

Weathered sandstone or iron-rich sedimentary rock

Quartz-rich sandstone, likely ferruginous sandstone

AI-generated identification · may be incorrect

Tan to rusty brown, earthy and dull to weakly granular, with visible sand-sized grains and irregular fracture; chiefly quartz with iron-oxide cement. Hardness is approximately 6–7 for quartz grains, though the specimen may crumble; no obvious cleavage, and specific gravity is commonly 2.2–2.6.

Identified September 21, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand was deposited, compacted, and cemented, with iron oxides producing the ochre coloration; its exact geological age cannot be determined from the image. Weathering has rounded and roughened the surface.

Uses & applications

Used as building stone, aggregate, landscaping material, and occasionally as a decorative slab; this small rough fragment has little commercial value.

Geological facts

The rusty color commonly comes from hematite or goethite coatings between quartz grains. A streak, grain texture, and reaction to dilute acid help distinguish it from limestone or iron ore.

Field identification & locations

Common in terrestrial sedimentary formations worldwide, including sandstone belts of North America, Europe, Africa, and Australia. Look for visible sand grains, layered texture, and a white-to-tan streak; it should not fizz strongly in dilute hydrochloric acid.