sedimentary

Sandstone

Sedimentary Rock (Quartz arenite)

Hardness of 6-7 on the Mohs scale, typically tan, brown, or reddish, with a dull to earthy luster and a clastic texture.

Identified October 26, 2026More sedimentary →

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Physical properties

Hardness of 6-7 on the Mohs scale, typically tan, brown, or reddish, with a dull to earthy luster and a clastic texture.

Formed through the accumulation, compaction, and cementation of mineral particles or rock fragments, predominantly quartz, over millions of years.

Widely used in construction as a building material, for paving, and in the manufacture of glass and concrete.

Sandstone often preserves ancient environments like deserts and beaches, and famous historical structures like Petra were carved directly into it.

Easily identified by its gritty texture and visible sand grains; commonly found in riverbeds, deserts, and sedimentary basins worldwide.

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)