sedimentary

Red Sandstone

Quartz arenite / Arkose

Mohs hardness of 6 to 7; reddish-brown color due to iron oxide; dull luster; clastic texture with visible sand grains.

Identified October 19, 2026More sedimentary →

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Physical properties

Mohs hardness of 6 to 7; reddish-brown color due to iron oxide; dull luster; clastic texture with visible sand grains.

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

Widely used in construction, building facades, paving stones, and landscaping.

Many famous architectural monuments and ancient structures worldwide are built from red sandstone.

Identified by its gritty texture and distinct reddish color; common worldwide in sedimentary basins.

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)