sedimentary

Weathered sandstone or iron-rich sedimentary fragment

Quartz-rich sandstone, possibly ferruginous sandstone (SiO₂-dominant)

AI-generated identification · may be incorrect

Small, irregular, granular brown-gray fragment with a dull earthy luster and no visible crystals or cleavage; likely Mohs hardness about 6–7, though cementation and weathering may reduce apparent hardness. Exact identification requires a fresh surface, streak, and acid testing.

Identified August 9, 2026More sedimentary →

Explore Weathered sandstone or iron-rich sedimentary fragment in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Likely formed from compacted and cemented quartz-rich sand, with iron-oxide staining producing the rusty color; age and specific depositional environment cannot be determined from the photograph. Such rocks commonly form in river, beach, dune, or shallow-marine sediments.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and landscaping material; this small fragment has little commercial use but may be a local geological specimen.

Geological facts

The rough, sand-grained texture and rusty coloration are consistent with iron-bearing cement or weathering. It could also represent a weathered volcanic or metamorphic fragment, so the identification is provisional.

Field identification & locations

Look for visible sand grains, a gritty texture, and resistance to scratching with a steel knife; quartz-rich sandstone typically does not fizz in dilute hydrochloric acid. Common worldwide, especially in sedimentary basins.