sedimentary

Weathered sandstone or iron-rich sedimentary rock

Quartz-rich sandstone, likely ferruginous sandstone (SiO₂ with iron-oxide cement)

AI-generated identification · may be incorrect

Hardness about 6–7 for quartz grains; rusty orange-brown, dull to earthy luster, granular texture, and no visible cleavage. The rounded shape and porous-looking surface indicate weathering and abrasion.

Identified August 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand-sized quartz grains were deposited, compacted, and cemented, with iron oxides producing the brown-orange color; exact age and locality cannot be determined from the image.

Uses & applications

Used as building or paving stone and occasionally as a decorative specimen; this ordinary fragment has little jewelry value.

Geological facts

Iron-oxide staining commonly produces hematite- or limonite-rich red, yellow, and brown sandstone. Its apparent smoothness may result from stream, beach, or landscaping abrasion.

Field identification & locations

Identify it by gritty texture, visible sand grains, earthy fracture, and lack of crystalline cleavage; common worldwide in sedimentary basins and gravel deposits. A hardness test, streak, and close examination of grains would improve identification.