sedimentary

Weathered sandstone or iron-rich sedimentary rock

Sandstone, likely quartz-rich with iron-oxide staining

AI-generated identification · may be incorrect

Small, rough, tan-brown fragment with dull earthy luster and weakly visible granular texture; typical hardness is about 6–7 for quartz-rich sandstone, with no obvious cleavage. Exact identification requires testing grain texture, streak, hardness, and acid reaction.

Identified September 4, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed when sand grains—commonly quartz—were compacted and cemented, possibly later stained by iron oxides during weathering. The specimen’s geological age and precise formation environment cannot be determined from the image.

Uses & applications

Common sandstone is used for building stone, paving, landscaping, aggregate, and carving; this small unremarkable fragment has little commercial or jewelry value.

Geological facts

Iron oxides can produce the brown, yellow, or reddish coloration. A magnified view may reveal rounded or angular sand grains and cement between them.

Field identification & locations

Common in sedimentary basins, deserts, river deposits, and coastal formations worldwide. Look for visible grains, a gritty feel, and often a granular fracture; a weak acid reaction suggests carbonate cement rather than pure quartz sandstone.