sedimentary

Sandstone (Iron-stained)

Arenite (composed predominantly of SiO2)

Hardness 6-7 on the Mohs scale, earthy/dull luster, rough grainy texture, and brownish-grey color due to iron oxide cementation.

Identified October 17, 2026More sedimentary →

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Physical properties

Hardness 6-7 on the Mohs scale, earthy/dull luster, rough grainy texture, and brownish-grey color due to iron oxide cementation.

Formed through the compaction and cementation of mineral particles or rock fragments, typically in river, desert, or beach environments.

Commonly quarried for construction, paving, and decorative aggregate; small fragments hold little commercial use.

Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks on Earth and frequently preserves fossil traces.

Identified by its gritty, sandpaper-like feel and visible granular grains. Found globally in sedimentary basins and exposed cliff faces.

Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion

Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone or Siltstone

Arenite (if sandstone)

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)